Thomas Tuchel delivers worrying Kobbie Mainoo injury update to spark Manchester United concern

Mainoo had yet to play a minute at the tournament and was expected to get a run-out in Miami, but was once again left off the team sheet.And Tuchel has now issued a more detailed update on the player’s condition, explaining he had picked up a back problem in training.“Kobbie was injured in the last training session (on Friday) morning,” Tuchel said of the 21-year-old on Saturday. “He had a sharp pain in the back within the training and he was not ready to play.”Countless supporters have lamented Mainoo’s absence throughout the World Cup. He finished the Premier League season in impressive form under Michael Carrick and appeared in pre-tournament friendlies, but did not feature at all in the World Cup proper despite Declan Rice’s struggles.Injury worry: Kobbie MainooPAMainoo himself appeare