Rooney made his Major League Soccer debut Saturday as a second-half substitute and assisted on the third goal in D.C. United's 3-1 victory over the Vancouver Whitecaps in the first game played at Audi Field.
He continued saying that he still had two years left on his contract at Old Trafford and he could have very easily stayed there and collected his wages till his contract had expired but he chose otherwise.
On this point, Rooney said: "For whatever reason, I still don't know".
I felt I had done okay, was top goalscorer, played most of the season from midfield, but that's football.
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Rooney made it clear he won't be shy about speaking his mind. I said to Everton, "I'm not a kid. If you want me to stay, tell me" and we talked about it. As an 18, 20 or 21 year old, I wouldn't have been able to handle it as well as I have.
"Another tough week of training now and hopefully I can get a bit more game time next week", Rooney said.
A host of famous players have played in MLS in recent years, including the likes of Steven Gerrard, Frank Lampard and Ashley Cole, with the latter now playing for LA Galaxy alongside Rooney's former team-mate Zlatan Ibrahimovic.
But Rooney is the same age as David Beckham was when he debuted with the LA Galaxy in 2007.
"I think only because of performances - for Manchester United, Jesse Lingard got the opportunity to go and play in every game at the World Cup for England. I'm open to ideas he thinks can benefit the club".
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