Nikola Katic’s header won a controversial Old Firm derby for Rangers and cut the gap to Celtic at the top of the Scottish Premiership to two points.
Celtic need to play "psychologically better" in derby matches, says manager Neil Lennon following 2-1defeat.
"In the throes of the game, we weren't great," Lennon told BBC Scotland. "Non-reactive to things and we couldn't get our wingers into the game, hence we changed the system a little bit.
"But we can't give away cheap goals the way we did today, especially the second one. To give Katic that amount of space is really poor from us.
"We've got too much time on our hands to think things over. We've been on a brilliant run, it's come to an end, we just have to go again like we did the last time."
Source-
BBC