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Manchester United youngster Callum Gribbin trained with the first-team's returning internationals on Monday and could be included in Louis van Gaal's pre-season tour squad.

Gribbin, 16, trained with the handful of first-team squad members who returned to United's Carrington training base last week and Van Gaal kept him in the senior sessions on Monday.

Van Gaal is understood to have brought a number of under-18s into first-team training in an attempt to toughen them up as part of his infamous boot camp training.

United's manager promised he would take 'a lot' of youngsters on the Reds' tour of the United States and playmaker Gribbin is one of the most exciting prospects in the club's academy.

A goalscorer in the FA Youth Cup tie against Hull this year, he was linked with a move to Liverpool's academy earlier this year.

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The teenager's Twitter account is protected but he did tweet on Sunday: "Happy to train 1st team today."

Four years ago, Gribbin scored twice at the Amsterdam ArenA in a 2-2 draw between Ajax and United's Under-13s ahead of Edwin van der Sar's testimonial match.

Left-footed, Gribbin can operate across the front three and impressed from the right wing in the Under-21s' final game of last season at City as a substitute.

Gribbin does not yet boast a profile on United's Under-18s section online but it is expected one should be uploaded later this month.

See pictures from United U21s' win over City in May below