Erik ten Hag admits there is plenty of hard work to do after Manchester United 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 a travelling group mostly made up of youth players. Marcus Rashford, Mason Mount, Casemiro and Aaron Wan-Bissaka, though, were in the starting lineup, along with the veteran defender Jonny Evans. With Rosenborg already in league action, the hosts were far sharper than United, whose Czech goalkeeper Radek Vitek was forced to make a string of saves. The Norwegian club’s winger Marius Broholm twice struck the woodwork. Ten Hag made the expected sweeping changes for the second half, replacing all 10 outfield players with academy products. Rosenborg – having again hit a post – made the breakthrough when Noah Holm scored in stoppage time. United are set to face Rangers at Murrayfield on Saturday before heading to the United States to step up preparation. Ten Hag expects a much-improved display for their next run-out. “The result is not secondary,” the manager told MUTV. “Of course, we play pre-season, but at Man United the standard is you win games and definitely don’t lose games. So if you can’t win, don’t lose the game, like we did in the last second of the game, but of course, the performance is more important and the performance was below standards.” Ten Hag, who recently signed a contract extension until 2026, said: “We can talk [about] everything that is bad, but I am not that guy. I have seen and this is not the standard for top football. Top football, you have to achieve much higher standards, starts with any individual, make sure you are fit. “I know we can’t be match-fit in this moment, I know you need these games. The opponent is [playing already] in the league, so they have a much higher fitness level –but we are Man United and should perform better.”