Manchester United's teenage defender Timothy Fosu-Mensah has agreed in principle a new long-term deal at Old Trafford.

United manager Jose Mourinho was keen to seal the 18-year-old Dutchman's future at Old Trafford to underline his commitment to the club's tradition of developing young players. An official announcement should take place in the coming days.

Fosu-Mensah impressed in his 10 first-team appearances for United last season under Louis van Gaal, making his debut as a substitute for Marcos Rojo in a 3-2 victory against Arsenal in February.

Timothy Fosu-Mensah (left) has agreed a new long-term deal with Manchester United

Fosu-Mensa (right) committed his future to Old Trafford with an announcement due soon

He also played in United's FA Cup semi-final victory against Everton at Wembley.

Though eight young players including Paddy McNair and Ashley Fletcher have left United since Mourinho's arrival and others are available for loans or permanent transfers, the manager is likely to keep Fosu-Mensah in his first-team squad this season once the contract is finalised.

Fosu-Mensah signed for United from Ajax in 2014.

A promising young defender, Fosu-Mensah signed for United from Dutch side Ajax in 2014

United boss Jose Mourinho pictured in training with Fosu-Mensah at Carrington

Tall and quick, he is likely to be viewed primarily as a right back but he can also perform in the centre of defence.