Valencia will miss the rest of the season with a broken ankle.
Valencia suffered a suspected fractured and dislocated left ankle during United’s Champions League clash with Rangers last night.
“It looked really bad,” Fletcher said.
“Hopefully the scans show it is not as bad as we fear.
“After arriving from Wigan he had a great first season and was looking to push on this year. That is why the injury is a real blow.
“He has only just got back from the injury he suffered at the end of last season too.
“He is a strong character and a good lad. He has real determination and works hard. He will be back I am sure.
“He will have a long future at Manchester United.”
