Ole Gunnar Solskjaer’s side were beaten 1-0 at Villa Park in their only pre-season friendly of the summer.
United’s Premier League campaign begins next Saturday as they host Crystal Palace at Old Trafford.
And Shaw, who says he is ‘really disappointed’ with United’s loss to Villa, claims Solskjaer is striving to improve the attacking players in the squad.
‘Obviously it’s a friendly but I’m disappointed we didn’t win,’ Shaw told MUTV.
‘And we lost. I’m really disappointed, to be honest.
‘We create opportunities but struggle at times to find the back of the net.
‘As someone with the experience he has in that sort of position, the manager is really on to the players about that in training, trying to improve that.
‘But the main focus today was obviously getting minutes in the tank.
‘It has been a very disjointed pre-season, really. At the start of pre-season, there were only four of us training, with what’s going on at the moment, the quarantines and the internationals, so it was very difficult for us.’
‘We’re ready for the season,’ said Shaw.
‘We need to be strong and focused on winning trophies, not getting into the top four. A club like us should be winning trophies.’