Chelsea boss Antonio Conte feels Alexis Sanchez has improved Manchester United since his January signing.
Conte commented on the issues around United ahead of Sunday's trip.
"United were strong before and are strong now," he said. "When you add a great player like Sanchez you are stronger. But our situation doesn't change. We have to prepare for the game and my expectation is to see him on the pitch with Lukaku, then I don't know if they will have another midfielder or a number 10.
"We are talking about a top player, a fantastic player," he added, when asked about Pogba. "My expectation is to see him on the pitch. If he stays out it will be better.
"We are talking about a top player and every coach has to try to find the right way to manage him. He is showing at United he is a top player."