The 58-year-old pointed to the 26-point gap in the Premier League table between runners-up Liverpool and his fourth-placed former team as evidence of a massive gulf between the sides.
Ajax Amsterdam's Donny van de Beek grabbed an early goal to secure a precious 1-0 victory at Tottenham Hotspur in the first leg of their Champions League semi-final on Tuesday.
The 30-year-old joins Luke Shaw in the treatment room after the left back pulled out of the England squad with an injury on Monday.
Spurs beat Ajax 3-2 in the second leg of the semi-final on Wednesday and will face Liverpool on June 1 in Madrid.
United are unbeaten in all competitions since Solskjaer replaced Jose Mourinho in December and their improvement is down to the Norwegian's insistence on an attacking style of play, as opposed to the defensive fare served up by his predecessor.
Reaction to Tottenham Hotspur's last-gasp 3-2 Champions League semi-final win over Ajax Amsterdam.
News of all that's transpired on and off the football field
Images from the UEFA Champions League quarter-final first leg matches played on Wednesday