He impressed in their friendly win over AC Milan.
Sinclair, who is set to face Liverpool in Yankee Stadium on Wednesday, believes he is finally getting back to the form that saw him help Swansea into the Premier League in 2011
"This is probably one of the best pre-seasons I've had because I haven't had the minutes I'm getting now," he told the Daily Mail. "I feel great, you can see it in the performances. I'm scoring goals, I'm getting back to my normal self how I was at Swansea.
"Pre-season is probably the most important for any footballer to get those games. I feel great and hopefully now I can get more minutes and be ready for the season to see what happens."
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