Former Chelsea fullback Mario Melchiot believes Nemanja Matic will be a great signing for Manchester United.
United's interest in Matic has split the club's support.
But Melchiot told talkSPORT: "He was very crucial in some games Chelsea played last season and I think he did extremely well, even if he wasn't starting every game.
"There was a good balance in the midfield, sometimes with him or Fabregas next to Kante.
"You don't want to make your rivals stronger, especially in the midfield where Jose Mourinho is always focused on having a strong midfield.
"If he [Conte] makes the choice to let him go to Man United, he better have good backing because, if not, it might come back and bite you later."