It was a day to forget for "The Happy One" and his uninspired troops as Chelsea succumbed to a 3-0 loss at the Hawthorns.

Here are 5 things we learned from the final game of the penultimate week of the Premier League

The 27-million pound signing from Barcelona was crucial to Mourinho's bid to win the 2014-15 league title, and Mourinho still can’t stop smirking over what will definitely go down as one of the signings of the year.

Fabregas has an eye for a pass

The PFA team of the year saw fit to omit the former Arsenal man, something which obviously did not go down well with the Portuguese tactician, and why not?

Leading the assists column (18) in the BPL is no mean feat, and Mourinho was quick to point out the fact by stressing that the current selection of the Premier league's best XI lacked balance in midfield, a balance only his No.4 would bring.

Fabregas had the opportunity to etch his name in the Premier League record books by adding another 3 assists to topple the great Thierry Henry, whose record of 20 assists in a season still stands tall.

His sublime slide pass on the volley to Andre Schurrle against Burnley in Chelsea's 3-1 win showed why Cesc had seamlessly fit into the Chelsea fabric, off the pitch and most importantly, on it.

As it stands, King Henry's record will stay for another year because Fabregas put in an inch-perfect cross that he will forever regret.

They say you’re a victim of your own success, and when you’re Cesc Fabregas, it was a case of one cross too many!

It was when play was suspended, it was when Diego Costa had got into yet another scuffle with a centre-back in the Premier League, it was when that cross was least needed, and shockingly it caught Chris Brunt smack on the side of his head.

On another day, that pass would have met the head or feet of his compatriot Costa and would have seen the back of the net.

On Monday night though, Fabregas saw the inevitable red, and will miss the crowning moment when Chelsea play their final game at home to Sunderland.

A Three-match ban that will also see him miss the start of the 2015-16 season.

Cue Sir Ian Mckellan as Gandalf and the stinging warning in his evergreen baritone.

Football in Mourinho Land

If Mourinho were to somehow plot the coupe of the century and replace the dictator-esque Sepp Blatter at the top of the football hierarchy, the beautiful game would not be the same ever again.

Recap the entire season and Chelsea's defeat to West Brom wills most certainly take the crown as the most ill-disciplined, listless performance from the Blues.

They say save the best for last, in Chelsea's case it was the managers comments after the game than his gameplan, or lack of it on the pitch.

Diego Costa was lucky not to see red after a spat which involved an elbow-bearhug combo with defender Gareth McAuley

Fabregas was rightly sent off for one of the most bizarre dismissals youll ever see.

John Terry was left sweating after his last-ditch challenge inside the 18-yard box on Saido Berahinho, clearly obstructing a goal-scoring opportunity for which the referee decided to ignore the rulebook and only gave a penalty, when a sending-off was in order.

But as always, it was Chelsea's favourite manager who stole the show.

A smug smile which resurfaced every other second, a pouting of the lips, and not a care of the world.

He mentioned the plight of his well-documented foe, Pep Guardiola and his Bayern team losing back and forth in their domestic campaign after their championship status was confirmed.

Highlighted the apparent inability of the referee to handle the Fabregas situation, that Martin Atkinson could have let the Spaniard off with a verbal slap of the wrist.

Blamed the Baggies defence for winding up Diego Costa. Like he ever needed one.

All of that, wrapped with a look of "I’m the best at what I do"

Football will look like a different game in Mourinho Land. The referees carrying garlands for cards, a foul only considered one when Mourinho saw fit, hs players unbeaten for as far as the annals of the game would date.

Saido Berahino: Will he or wont he?

It’s easy to get confused between Saido Berahino and Liverpool forward Raheem Sterling.

Both mercurial talents of the English game, both forwards with a knack of scoring, both "starlets" in tow to become 'Stars', sadly both patrons of hippy crack.

With the transfer merry-go-round to resume from June 1st, both might be angling for a move away from the clubs that made them worthy for one.

Berahino though, seems to be the one with all the maturity but not before the arrival of hard-hatter Tony Pulis.

England Under-21s' Player of the Year, he has had an outstanding season on the pitch with 14 goals already.

But the starlet was punished by magistrates for drink-driving and has also been fined by Albion for turning up late to games.

Not the best attitude for a young player looking to "move on to bigger things" as he was quoted a couple of months ago.

What has followed is a sea change, a desire and a commitment to the club which has seen his stock rise evermore. His brace against Chelsea was the highlight of the 90 minutes as the Baggies faithful sang his name in unison.

After the game, manager Tony Pulis gave a glowing review of the 20-year old, but just like his teenage England compatriot could Berahino be looking for pastures anew if the big guns come calling?

Will we see another JT?

It was "Academy Day" as Jose Mourinho calls it, a rare opportunity for the future of Chelsea to show their worth, to leave an impression on the gaffer.

Nathan Ake, Ruben Loftus-Cheek, Izzy Brown were all living their dream to play for the club that they had represented in almost every age group.

Following a an U19 victory in the UEFA Cup final against Shakhtar Donetsk, it was late substitute Izzy Brown who made sure the Chelsea cubs came back with the crown in Switzerland.

But the record of their manager will not inspire these young turks to pursue their dream in blue.

Mourinho has a track record of never bringing through youth from the academy. From his Sporting days, to his Madrid adventure, Mourinho has been a huge fan of readymade talent, players who take less time for incubation and even lesser to win honours.

The very same reason he has a burgeoning trophy cabinet. A man with a habit of instant success, Mourinho takes pride in producing teams, not squads. The same reason why he chose to play the same 11 players for almost all games, all seasons, all competitions.

Names like Josh McEachran, Gael Kakuta have suffered at the hands of the Portuguese and despite the wealth of talent represented by the likes of Dominic Solanke, Patrick Bamford among others, it might be a wilderness of short-term and long loan spells before they find their place among the senior eleven.

Does it come as any surprise then that John terry was the last Cobham product to break into the first team? Sad but true.

Diego Costa: Explosive striker or ticking time-bomb?

Every team has a character among their ranks.

The Joker, The Introvert, The bad dresser.

In Diego Costa's case he is The Team Man. The new and old among the Chelsea squad took little time to warm up to the former Atletico Madrid man. It is what he becomes when he crosses the white chalked line that sends warning signs everywhere. John Terry in the course of the season mentioned the fact that Costa took it upon himself to go "to war" as soon as he stepped on the green grass and expected his teammates to rally behind him.

The siege mentality, if you may.

They followed suit, but who decides where to draw the line?

The Brazillian has been the catalyst for Jose Mourinho's team, scoring at will and more importantly when the occasion demanded. His exploits in front of goal have come in handy barring the times he has decided to take the law into his own hands. Shoving, stamping, jostling his way to the end of the season, he has picked up numerous bans on the way. Add to that a dodgy hamstring and the game against West Brom on Monday night would have held more value than it did had it not been for the individual brilliance of Hazard to save their blushes.

Mourinho has been all praise of his #9, and in extension has defended him vehemently.

What the Portguese master now has to decide is how long a rope do you throw at Costa.

Old habits die hard, and one remembers Cantona's mercurial temperament when he was banned by Man United for 9 months for scissor-kicking a fan in 1995, United went on to finish second, hamstrung by the absence of their talisman.

Chelsea and Diego Costa have escaped scot-free, but the Brazilian is playing a dangerous game