James Wilson is back in action after a knee injury. John Peters/Man Utd via Getty Images

James Wilson will not be part of the Manchester United's squad for the preseason tour of the United States and will instead head to Austria with the under-23s, sources have told ESPN FC.

On Saturday, manager Jose Mourinho is set to finalise his squad for games against LA Galaxy, Real Salt Lake, Manchester City, Real Madrid and Barcelona.

But Wilson, 21, will not be part of the group and will instead be in new U23s boss Ricky Sbragia's squad.

The striker spent the first part of last season on loan at Championship side Derby but made only four appearances before his campaign was ended by knee injury in October.

He has scored four goals in 20 games for the United first team after being handed his debut by caretaker boss Ryan Giggs in 2014.

Both the United U23s and U18s flew to Austria on Saturday for a week-long training camp.

Both Tahith Chong, who missed a chunk of last season with a knee injury, and Joe Riley are part of the group along with Angel Gomes, who made his first-team debut on the final day of the Premier League season.