Manchester United boss Erik ten Hag admits there is plenty of hard work still to do after his side opened their pre-season preparations with a 1-0 defeat away to Rosenborg.
The majority of the first-team squad were not involved in Trondheim, and Jadon Sancho - who has returned to training after resolving his differences with Ten Hag - was also not part of the travelling group which was mostly made up of youth players.
