After a trophyless return to Chelsea last season, Jose Mourinho has made three major signings that puts his team ahead of every other English Premier League side. The outspoken manager strengthened every position in his squad by acquiring three La Liga superstars.

Cesc Fabregas, Diego Costa and Filipe Luis bring quality, experience and expertise to a club that desperately needs those three characteristics after Frank Lampard and Ashley Cole’s departure. The three dynamos should step right into the starting lineup and fix all the issues Chelsea had last season.

Fabregas’ addition solidifies Mourinho’s relatively young midfield. The former PFA Young Player of the Year will act as the leader and the base of offensive operations. In other words, everything goes through him.

The 27-year-old will most likely take Lampard’s spot as a deep-lying playmaker, with an emphasis on the playmaker. Alongside him will be Nemanja Matic and in the No.10 position will be Brazilian sensation Oscar.

The trio will form a triangle that’ll efficiently complement Chelsea’s flamboyant wide players. Combine Eden Hazard or Mohamed Salah on the left and Willian or Andre Schurrle on the right with the three in the middle, and you have a midfield that’s capable of perforating the most staunch backline.

With Lampard no longer in the picture, Chelsea needs a midfielder that is capable of duplicating the legend’s scoring tally, and there isn’t many in the world that’s more clinical in front of goal than Fabregas. Sixty-three percent of the ex-Arsenal captain’s attempts were on target last season, and he managed to sneak in eight goals.

During his decorated career, the versatile midfielder has also been deployed as a false No.9.

He famously played that position during Spain’s successful UEFA Euro 2012. He immediately found success in the first game scoring his country’s lone goal in a 1-1 tie against Italy. He would go on to score one more time in the tournament.

Fabregas’ Spanish colleague, Costa, is Chelsea most relevant summer acquisition. The physically imposing centre-forward is the true No.9 the Blues desperately needs. Despite his poor World Cup showing, Costa should fit perfectly into Mourinho’s system.

Before I dig deeper into what Costa brings to the table, I’ll like to state that the 25-year-old might not live up to expectations in England because of Chelsea’s track record of turning world-class strikers – Fernando Torres, Hernan Crespo, Andriy Shevchenko ‒ into flops.

Just like the forwards mentioned, Costa has made a name for himself at the highest level. The 25-year-old helped Atletico win the Spanish league and was minutes away from UEFA Champions League glory.

Now back to why Costa is the missing piece of the puzzle.

As he ascended out of the shadow of Radamel Falcao, Costa showed the world that he is a multi-dimensional scorer. He can play with his back or front facing goal. His physique makes it easy for him to overpower defenders and his agility allows him to chase after long passes or run in behind defenders for through balls.

Unlike Arsenal’s Olivier Giroud, Costa is more than a target forward. Giroud contributes in numerous ways, but he is glued to the middle of the pitch and he relies heavily on crosses to be a scoring threat. As long as Arsenal’s deft ball movement is contained, center backs can easily lock Giroud down.

Costa isn’t easy to control because he is more mobile and adept than Giroud. Instead of just checking to the ball and shielding it from his marker, Costa has the presence of mind and athleticism to open up his body and make timely runs around his defenders.

I’ll use his goal against Real Madrid last season as an example. As the play developed, the Brazilian born striker drifted wide until he was side-by-side with the right-back. When the ball fell to Koke in a congested area, Costa knew checking to the ball would be the wrong decision. He decided to turn and accelerate into the space vacated by the fullback.

His run was rewarded with a delightful pass, and the rest is history.

These are the valued qualities the highly-rated forward will bring to Stamford Bridge in the upcoming season. As long as he’s fit, Costa should be very productive under Mourinho. So say Premiership Tips, who are tipping Chelsea to win the title this season.

In Luis, Chelsea might have signed the most ideal replacement for Cole. Bleacherreport.com’s Sam Tighe calls the Brazilian, who should have been called up by Brazil for the World Cup, “the most complete left-back in football.”

Even though I think Bayern Munich’s David Alaba is a step ahead of Luis, it’s hard to disagree with Tighe. The 28-year-old is the epitome of constituency. He delivers above average performance in every game he plays.

Luis is an all-around player that rarely loses focus on the defensive end. He is a well-disciplined fullback that’s blessed with excellent awareness. He knows when to go forward, when to tuck inside and he’s always at the right place at the right time. According to Whoscored.com, Luis made 4.1 tackles and 1.7 clearances per game in his final season with Atletico.

His acquisition will allow Hazard to express himself. The Belgian winger isn’t popular for his defensive discipline. He tends to forget that he has to track back, which leaves the fullback in a two on one situation.

Now that Hazard has Luis behind him, Mourinho would sleep better at night knowing that the world-class fullback is capable of picking up the winger’s slack.

As we all know, three individuals can’t win trophies by themselves. It takes a fine-tuned group of men to survive and conquer a gruesome, but exciting, EPL season. And that group of men is at the disposal of one of the best tacticians in the world.

The Portuguese gaffer has the depth needed at every position to dethrone Manchester City.

In goal, he has two of the best shot-stoppers in Europe. Petr Cech has the experience and Thibaut Courtois has proven that he is just as good as Cech, if not better.

With Luis added to the defense, Chelsea might have the most complete backline in England. The ever-present John Terry proved that he’s still one of the best, Gary Cahill is motivated after a disastrous World Cup campaign and Cesar Azpilicueta is coming off a fantastic 2013-2014 season.

On the bench, Mourinho has Branislav Ivanovic and multiple young talents.

In the midfield, the bench is packed with top talents. Marco Van Ginkel has recovered from his injury, Oriol Romeu returns from his loan stint at Valencia and three players returning from the World Cup– John Obi Mikel, Victor Moses and Ramires‒ might end up staying with the North London outfit.

And finally, it looks like Torres will be Costa’s back-up.