Chelsea are looking to improve their squad this year and the real question is will they perform? Over the years Chelsea have spent a lot of money on players, some have exceeded their goals and others have failed badly.
Will their targets be hit or miss if they join the squad this summer?
This deal looks to be a done deal and should be announced before the World Cup begins. The price tag for Costa is at £32 million - his release clause. Chelsea have spent a lot of money on strikers in the past and fans are probably concerned with the recent acquisitions and hope they are getting what they are paying for.
Costa scored 36 goals in all competitions which lead Atletico Madrid to the Liga title, beating rivals Real and Barca, while they were runners-up in the Champions League.
Is he right for Chelsea?
Diego Costa is a very skilled striker and he knows how to find the back of the net.
Costa offers strength and power which the trio of Ba, Torres and Eto'o seem to be lacking - he can hold the ball up for others and power his way through the opposition. His game is rather similar to Chelsea legend Dider Drogba which could boost the squad massively.
He has been called a battering ram against defences they way he easily gets into the box and 9/10 its a goal. The problem that Chelsea may have with this deal is Diego Costa has a very short temper and it is very easy to wind him up which won't help Chelsea's title challenge if he is suspend for silly mistakes.
Will Mourinho play with just Costa up front or maybe add Torres alongside him to help him settle? The chance Spain may partner the two for the World Cup could benefit both players and possibly help them Torres rediscover the goal scoring touch.
Cesc Fabregas' transfer from Barcelona has been the talk over the past couple of weeks - but Chelsea have now confirmed the deal.
The Spaniard has the hardest task in football in replicating the form of Chelsea legend Frank Lampard who could win games on his own for the club.
Can he take the reigns?
If you knew you would be replacing an icon for the club you would be very nervous because the fans are grading you on everything you do. Many people believe this is a poor move for Chelsea because it is the equivalent of signing Bentiez and we saw how popular he was with the fans despite winning the Europa League.
His skill as a football player can't be questioned, he knows how to pass a ball and he is unlucky not to have been a regular at Barcelona because of Xavi and Inesta and the fact Barcelona have no plan B when it comes to tactics.
Cesc plays more direct passes and with Diego Costa or even Lukaku they can hold up the ball and look to pass or take a run at goal. He is better suited to the Premier League and from his Arsenal days he is one of the best at switching defence to attack.
Lukaku is probably the most talked about player over the last two summers and fans at Chelsea want answers to why he doesn't play. Mourinho doesn't seem to favour the big Belgium for reasons we do not know.
His latest link is with a loan move with Atletico Madrid - probably to smooth over the Costa signing. He would get the first team football he wants with the departures of Costa and Villa who has agreed a move to New York City Football Club and currently on loan in Australia. It would also allow him European experience at a big club, maybe this is why Mourinho doesn't trust him but only time will tell.
His role at the club:
The time has come for Lukaku to remain at Chelsea and I believe the link up between him and Chelsea's golden boy Hazard can be a big factor in this. During the warm ups they have clicked very well and this will be a factor Mourinho can't overlook.
Lukaku has two years of goalscoring experience in the Premier League and has outscored Chelsea's strikers in the last two seasons. Ba and Eto'o look set to leave the club while reports claim Torres still has a future so will the new strike force be Diego Costa, Torres and Lukaku?
With Financial Fair Play Chelsea can't afford to splash out on another big name but they need to look at their youth who did the double this season. They have a high number of talents who can become Chelsea legends and Lukaku has proved what he can do and deserves his chance to be the man.
Mourinho has nothing to lose by playing him, the fans will be happy so will the player and who knows he might actually score 30 goals and help Chelsea to win trophies.
Write for GiveMeSport! Sign-up to the GMS Writing Academy here: http://gms.to/1a2u3KU
DISCLAIMER: This article has been written by a member of the GiveMeSport Writing Academy and does not represent the views of GiveMeSport.com or SportsNewMedia. The views and opinions expressed are solely that of the author credited at the top of this article. GiveMeSport.com and SportsNewMedia do not take any responsibility for the content of its contributors.
Do YOU want to write for GiveMeSport? Get started today by signing-up and submitting an article HERE: http://gms.to/writeforgms