Speaking for the first time since learning United will have to play league games on Sunday, Tuesday and next Thursday, Solskjaer added: “It’s made by people who have never played football at this level.
“It’s physically impossible for the players.
“We are going to need everyone for these four games. It’s a short turnaround but we have to be ready.”
United, who are second in the Premier League, are away to Aston Villa on Sunday (14:05 BST).
Their home match with Liverpool, postponed on Sunday after about 200 fans broke into Old Trafford to protest against the Glazer family’s ownership of the club, has been rearranged for Thursday, 13 May (20:15).
The decision means United must play two games in the space of 50 hours as their home game against Leicester has been moved forward a day to Tuesday, 11 May (18:00).
United also host Fulham on 18 May and finish their league campaign at Wolves on 23 May before heading for Gdansk, Poland, to play Villarreal.
