Former Premier League striker Darren Bent has insisted that Chelsea star N'Golo Kante has not been at his best recently.Kante has been an integral player for Chelsea since joining them from Leicester City in 2016. The France international played a key role for Thomas Tuchel's side in their Champions League triumph last term, winning the Player of the Match award in the final.Star Sports Football@StarFootball"To play for #Chelsea is one of the big things of my career." - N'Golo KanteIf you could describe the midfielder's time in London in word, what would it be?#PL1:00 AM · Jan 25, 2022172"To play for #Chelsea is one of the big things of my career." - N'Golo KanteIf you could describe the midfielder's time in London in 1️⃣ word, what would it be?#PL https://t.co/XjLmdkMht4However, there have been concerns about the 30-year-old midfielder's form recently. Kante was sidelined for a couple of games due to COVID-19 in January. He featured in five matches for the Blues last month, but only started three of them.Bent has now gone on to claim that the midfielder does not look like his usual self. The former Tottenham Hotspur striker insisted that the Frenchman has been giving the ball away quite frequently. He told talkSPORT [via The Chelsea Chronicle]:“Kante, at the minute, he hasn’t looked like the Kante of old. He’s been giving the ball away a lot recently, which is not like him."Despite Bent's claims, Kante provided two assists for the European champions last month. However, the Frenchman could not help Chelsea win any of the three Premier League games he started in.Kante will hope to bounce back to his best when the Stamford Bridge outfit return to action against Plymouth Argyle in the FA Cup on 5th February.With the Club World Cup and the Champions League Round of 16 on the horizon, Tuchel's side will be keen to see Kante regain his form soon.Kante has Chelsea contract expiring in 2023Thomas Tuchel's side are currently focused on resolving the contract situation of their key defenders. Antonio Rudiger, Andreas Christensen and Cesar Azpilicueta are in the final six months of their deals with the club.Frank Khalid@FrankKhalidUKThomas Tuchel on Antonio Rudiger contract latest. Edit:-@onformfootball3:31 AM · Jan 22, 202287934Thomas Tuchel on Antonio Rudiger contract latest. Edit:-@onformfootball https://t.co/qsocWYkMwlThe Blues now face the prospect of losing the trio for free at the end of the season. The London giants could be keen to avoid such a situation with Kante, who has his contract with the club running out in 2023.