Manchester United midfielder Ander Herrera is impressed by the youngsters included in their US tour squad.

Joe Garner and Angel Gomes are both working with Herrera in United's midfield, while striker Mason Greenwood has also been given a chance by manager Jose Mourinho.

"I am also very surprised about Garner. Angel also has a lot of quality and the striker [Greenwood], I didn't know he was 16 years old and he was fighting against men, so I am very confident and I hope one day that they kick our a** out of the club," he told reporters.

"That will show that the club is doing the right things."