United kickoff their Europa League campaign against Astana.
Solskjaer said, “I think modern football is more and more about high intensity and more and more teams are successful in the high press. You have to be really fit to do that," the United manager told UEFA.
“Our fans at Old Trafford love attackers closing down defenders and not giving them a moment.
“That's what we want to get to – don't give a team a chance to breathe when they're at Old Trafford."