'It's so unusual, the Arsenal one.
'We've done well, of course.
Their comeback win booked their place in the Champions League quarter-finals for the first time since 2014.
'I didn't have a schedule, I had until May to do whatever I could with the team and playing style and mood.
"You can never be 100 per cent sure but Alexis is such a determined lad, he loves football, so I'm sure he's doing everything he can that when he comes back he's going to show his best side".
In-form Romelu Lukaku will need a late fitness test ahead of Manchester United's FA Cup quarter-final against Wolves on Saturday due to a sore foot. Captain Ashley Young is definitely out through suspension.
Solskjaer said he was "hopeful" the striker would pass an injury assessment on Friday.
Ander Herrera is expected to return from a hamstring injury after resuming training with Jesse Lingard, and Phil Jones is available again after illness. "There have been so many players out".
"Obviously we've got a decision to make as to who is match fit", said Solskjaer.
However, Alexis Sanchez is not expected back until next month after having treatment on a knee injury in Barcelona. 'He's not been on grass yet, he's been seeing his people in Barcelona and he's still a few weeks away.
"If we get to Everton, Manchester City, Chelsea - that period - he probably will be available".
Meanwhile, Solskjaer has also offered support to Paul Scholes, who resigned as Oldham manager after just 31 days on Thursday by extending an invite to his former United teammate to visit Carrington. "You've got to ask him".