Ally McCoist wants more consistency from his Rangers team after they surprisingly exited the Scottish Communities League Cup.
The holders were dumped out by Falkirk just days after they toppled arch-rivals Celtic in a six-goal thriller at Ibrox.
McCoist knows their Celtic games are huge, but he insists they are not the be-all and end-all in terms of the Scottish season.
The Gers boss is still stunned by their cup exit and he expects a response from his troops in Saturday's trip to Dunfermline.
"As I've said 100 times, the Celtic game is massive but it's not the be all and end all," he told the club's official website.
"It's no use performing out of your skin against them if you can't do it elsewhere.
"That's the biggest thing about playing at this football club - you have to be able to do it in every game and we need a good reaction now."
McCoist admitted his players could be accused of taking victory for granted in the wake of their 4-2 success over Celtic.
"It's fair to suggest that might have been the look," he said. "Absolutely.
"I'm not sure that was the case but coming off a terrific performance at the weekend against Celtic, we were worried sick this might happen.
"We warned the boys about that before the game but the warning obviously wasn't taken and we only started realising we were getting knocked out when we went 2-0 down.
"Although we got back into the game at 2-2, we still weren't good enough. Right now, this is one of the biggest disappointments I've had and I'm very angry."