"Matic knows very well what I think about him", he said.
But Mourinho was nevertheless impressed with his former Chelsea charge: "I think he played really well, I think in the moment they were moving the ball well of course was hard for us in the midfield".
Lampard has no doubt that Matic's arrival will make United stronger.
"For me, Matic is a fantastic player - a real, real top player", said the English defender. People at the club seemed to mull it over for quite a while and then out of respect for Petr and what he'd done, and the situation with [Thibaut] Courtois, they let him go.
"He needs to play regularly, he's a player I trust a lot". Lukaku, 24, has been brought in to replace Zlatan Ibrahimovic and will hope to do a better job of impressing manager Jose Mourinho than he managed during their time together at Chelsea.
Conte added that he was optimistic Morata, who Chelsea signed for a club record £70m, has a bright future ahead of him at Stamford Bridge. We are the most physical league.
"But I am happy for him that he scored a goal after that and I'm sure that he will continue to score goals and that he will score many this season". You've got to understand what the club is all about.
"I heard whispers at the back end of last season that he wanted to go and even if the club can not come out and say too much about that, maybe there was an element of that in play here when this deal went through".
Conte has repeatedly stated Chelsea's need to improve their squad depth in the final weeks of the summer transfer window, and Lampard remains confident that the Premier League champions will get the players they need to compete on four fronts this season.
"I think he brings aggression to United's midfield, which is something they have been lacking".