Allan McGregor has urged caution after Rangers maintained their seven-point lead over Celtic at the top of the SPL table.
The Glasgow giants played out a 1-1 draw at Celtic Park on Sunday, with Gers goalkeeper McGregor making an important late save from a deflected Georgios Samaras effort.
Rangers therefore remain in pole position at the halfway point of the season, although recent history suggests Celtic are still very much in contention.
In both of the last two seasons the team leading the championship in the first week of the New Year has failed to go on and win it, while Celtic still have a game in hand on their rivals.
"We are in a good position but Celtic have a game in hand and I would expect them to win it so I think we are probably looking at a four-point lead," McGregor told Rangers' official website.
"In the last two seasons the team that has been leading at this stage of the season has not won the league so we need to be cautious.
"We have to get back to doing what we are good at and return to winning ways this month.
"We had a great December and we have been fortunate to get away with a draw at Parkhead.
"However, it's obviously a great result for us."
McGregor was delighted to help Rangers claim a point by keeping Greek striker Samaras at bay.
"It was a good save from the Samaras shot especially at that point in the game five minutes from time," he said.
"I think the shot took a wee bit of a deflection and I just managed to get it over the bar.
"I'm not sure if it's the best in my career - I will need to look at it again.
"It was instinctive. I just stuck my hand up and hoped that the ball wouldn't go in and it didn't."