The transfer market saw a lot of homecomings. Pogba to Manchester United, Mats Hummels to Bayern Munich, Mario Gotze to Borussia Dortmund and David Luiz back to Stamford Bridge.

Having cost Paris Saint-Germain £50 million in 2014, Luiz is the most expensive defender in the footballing history. He returned to Chelsea after two years in Paris, for a reported fee of £34 million and signed a three-year deal.

But is bringing Luiz back a really good decision? Or it’s a gamble? Let’s look why it’s a bad call:

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1. He's not a good defender...

Brazil v Germany - FIFA World Cup Brazil 2014 - Semi Final

His defensive contributions have aided in PSG’s domestic dominance in the French League, but was no less than a liability to them in their Champions League campaigns.

Luis Suarez, and a 7-1 thrashing at the hands of Germany. Ring a bell?

Everybody remembers the game he had against Barcelona and Luis Suarez, who nutmegged him twice in the Champions League quarter-final, humiliating him in Paris.

Nor did the Germans show any mercy as Brazil were thrashed in the semi-finals of the World Cup in 2014, played in Brazil. It seems he’s not a good player in his home stadium....

This just might worry Chelsea fans.

2. A Scorer but…

David Luiz 1

One thing Luiz is surely known for is his unpredictability.

Luiz has exhibited his penchant for scoring outrageous screamers, which is not expected from a defender. Long powerful shots, his ability to score free-kicks, the Brazilian defender has scored them pretty easily. But preventing a goal should be the primary concern for a defender and not scoring at the other end.

Tackling and holding up the defensive lines hasn’t been the Brazilian’s strongest suit.

3. An Expensive Back up option

David Luiz

Antonio Conte wanted to sign a centre back this summer and the news was dominated with their failed pursuit of Napoli's Kalidou Koulibaly. AC Milan's Alessio Romagnoli was also targeted but they couldn’t snatch him up either.

So what can be inferred?

David Luiz was actually not the first option for the Chelsea boss. Even Conte has admitted it was a 'last-minute' call to re-sign David Luiz on on deadline day.

The Brazilian lacks defensive qualities, so one can expect Conte to deploy Luiz as a back up to Cahill and Terry.

Quite an expensive back up though!