The 35-year-old added: "It is my 12th year now".
"It is a motivation for the players and personally as a defender". He made 50 appearances under manager Jose Mourinho the last season.
From the stunning debut that included a Champions League hat-trick against Fenerbahce, Rooney did it all at Old Trafford.
The Portuguese manager had sold him for £28m to Everton in 2014 during his second spell in charge of Chelsea. "I have asked my captain (Musa Mohammed) to man-mark him and if he causes him problems I will ask Musa to kick him".
Chelsea are reported to have made a similar offer but baulked at paying the size of the agent's fee Mino Raiola demanded.
Rooney, who has 119 caps for England, also said that he would be forced to retire from worldwide football if he had moved to a Chinese club.
"I always tried to keep it in when I came back to play against Everton for Manchester United", he told Sky Sports.
"It's good when you go away with the team".
Wayne Rooney hopes to force his way back into the England squad after completing a move back to boyhood club Everton, something he believes would have been impossible if he'd moved to China. He started with me as a No10 with Zlatan up front but then he changed the system a little and the lads who came in did well.
Since their arrival, team Everton has been taking trips around Tanzania and experiencing the country's culture as was seen in some of the photos where they were drinking local tea.
"It's what we need to improve".
Speaking in an interview, United and England's record goalscorer said: "It was around November I knew [I'd be leaving]".