"It will be a change for him, but I wasn't the same player at 24 as I was at 28".
"United were crying out for a central midfielder with the qualities of Nemanja Matic".
"Petr had done such a lot for the club, Thibaut Courtois had come in and it would have been harsh to stop him moving to Arsenal when he was so settled in London, but this is different".
Matic chose to call time on his second spell at Stamford Bridge after Chelsea emerged victorious in their chase of ex-Monaco man Tiemoue Bakayoko.
"There's pressure, but coming for £40 million from Monaco after a great season, the pressure was going to be there regardless", Lampard added.
"It's very important for us that our strikers score goals", Matic told MUTV.
"It is just how he uses that talent in the team".
No new Chelsea signing is under more pressure than Alvaro Morata, brought in for a club-record initial fee of £58m from Real Madrid to replace the unsettled Diego Costa as the focal point of Conte's attack.
Saddled with an ageing group of full-backs, Pep Guardiola found it hard to play the kind of thrusting football he loves in his maiden campaign as Manchester City manager.
The 23-year-old is not the finished article, but his energy and physical presence make his ideal for the Premier League. You've got to understand what the club is all about.
Matic was brought in to stabilise the midfield, and though United were overran, Mourinho was pleased with the 29-year-old's performance.
"Yes, for sure", the Italian said when asked if it will be hard to retain the title this season without making more signings.
"I think he played really well", Mourinho said.
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. You have to have faith in the manager.