Speaking to DAZN Bet, Di Matteo said: "World-class players have consistency, so if Mudryk can perform at a high level every week, then he'll be on his way to becoming a world-class footballer. He's shown glimpses of it, but he needs to produce those performances every game. That's the difference between an average player and a world-class one."
The former full-back was then quizzed on his outlook for the Blues this season after their recent upturn in form, which has included a 4-1 win over Tottenham and 4-4 draw with champions Manchester City, and added: "I think these hard fixtures may actually suit Chelsea! It's more difficult for teams to play against an opposition that defends with a lot of men behind the ball and waits for you in front of the box. It's more difficult to break them down and find spaces. I watched Chelsea's first game of the season, against Liverpool, and they did really well. They were also good against Arsenal. I think these teams may suit Chelsea and they could surprise us! 'I think Chelsea can finish in the top six. Top four is probably a bridge too far.''