The Ibrox side enjoyed a 2-0 victory as Motherwell's woeful run of results against the Ibrox side continued.
Next up for Motherwell is Celtic on Saturday, and McCall has told his players that on last night's form, he has no-one other than a goalkeeper good enough to start the game.
"I don't know how many hours sleep I get after that," he said.
"Other than our keeper I don't think there are too many players who could come away from that pleased with their performance.
"If I was to look at individuals and their performances, I would struggle to name a team for Saturday.
"That might be harsh on certain individuals because we have got to realise we have had seven games undefeated in the league, and I don't want there to be a knee-jerk reaction.
"But it is hugely disappointing from players who can do better."
McCall acknowledged the Rangers support played a significant part in the victory, although the lack of self-belief from his players was puzzling.
He said: "If you ask anyone who has watched Rangers all season, they haven't played anything like that.
"But that was always going to be the case. It was their biggest game, the fact that an SPL club were coming, but we had to have belief in what we were doing.
"As good and hungry as Rangers were, especially after the first goal, I look at my side and we weren't good.
"We lost too many individual battles."
McCall also admitted that at the break, there was a feeling that whoever got the first goal would go on to win.
"We wanted to start the second half at a good tempo and instead we gave the ball away," he sighed.
"As soon as the first goal went in you could sense the crowd being lifted and their players seemed to get an extra yard.
"We didn't get anywhere near to the heights we have done all season, although you would have to give credit to the Rangers players and supporters.
"They really lifted their players and we felt as though we needed to get the first goal and we never."