Sinclair agrees with Lampard's pursuit of a new left-back and striker.
He told GentingBet: "There are two obvious positions in which Chelsea need to improve their squad – left back and a striker. Both left backs this season, Emerson and Alonso, haven't really grasped that position and played a lot of games consistently. Emerson has come over to England, he's a talented attacking left back but he can struggle in the defensive third, and he hasn't been the mainstay in that position as was expected at the football club.
"When you look at Alonso, he's better as a wing back than an actual full back in a back four. So, the left back position is somewhere that needs to be looked at. There have been rumours about Chelsea signing Ben Chilwell – if you had asked me six months ago, I would have said that he was the ideal left back for Chelsea but his form has dipped towards to the back end of the season, which has made me question him. You have to remember, it is a massive difference being a player at Leicester City and Chelsea. At Chelsea, you have the expectation of winning games every week, winning titles and European Cup Competitions.
"Lampard will also need to address the centre forward situation at the club. Tammy Abraham has been excellent, but he has really had to carry the baton on his own all season. Only now, has Giroud come to fruition and led the line quite well but if Chelsea want to get into a situation where they are challenging Liverpool and Man City, then they need to add a world class centre forward.
"The club have been rumoured with centre forwards across the world; the likes of Luka Jovic and Timo Werner, but for me, I'd like to see Chelsea bring in a proven Premier League striker – which is the hardest thing to do. It needs to be an experienced player, someone who is going to be Number One when Tammy Abraham develops, because as a young striker around the country, there isn't really any that are better than Tammy Abraham."