United got their campaign off to the worst possible start, losing to the weakest side in the group on paper away from home.
Despite taking a 1-0 lead, a ten-men United were eventually beaten 2-1 thanks to a 95th minute Young Boys winning goal.
Solskjaer told reporters about the squad's reaction, per the club website: "Of course, you wait to see, when you see them this morning, when you come back in.
"The attitude is like you expect it to [be], they're focused, of course a little bit disappointed but not too downbeat.
"You know it's a setback, we have to do better and we've got five games to get those 10, 12 points we need.
"Of course, it's not the start we wanted but we're a team that can bounce back again and the group is very good."