Manchester United will be without four key players as they prepare for a must win Champions League clash against Valencia.

United won their first group game against Young Boys, but it is their overall form that gives cause for concern.

The club drew with Wolves in the Premier League, lost to Derby in the League Cup, and then lost to West Ham in the Premier League.

It is unclear what team or formation Mourinho will employ for this game, after his back three experiment failed against the Hammers.

But he will have to make do without Ander Herrera, Ashley Young, Jesse Lingard and Marcos Rojo.

None of those players trained ahead of the critical game.