Goals from Steven Davis and Nacho Novo kept Rangers at the summit of the Clydesdale Bank Scottish Premier League despite a late strike from David Clarkson which proved to be too little too late from the visiting side.
"We've got a big pool of players and I have to show everyone that they have to be at the top of their game," he said.
"Neil came after Allan McGregor had an exceptional season for us until getting injured in the latter stages of last season and he played very well.
"As soon as Allan came back, he came back into the team and I just feel at times that I have to use the whole of pool of players to keep an edge in the squad.
"We don't have the number of games that we had last season and it's up to every player to make sure that he keeps himself as well-prepared as he possibly can.
"It will happen to more players than Allan McGregor throughout the season. We have a squad of players and we have to use them.
"As long as it keeps everyone at the proper level, that's fine."