Charlie Mulgrew insists the spirit and determination Celtic showed at Kilmarnock should put them in good stead against Rennes in France.[LNB] The Parkhead men were losing 3-0 at the interval at Rugby Park and looking like they would go 13 points behind leaders Rangers, who were playing St Mirren at Ibrox later in the day.[LNB]But in a dramatic second-hand turnaround, Celtic scored three times, with Mulgrew levelling with a close-range header, while St Mirren grabbed a late equaliser in Govan to keep the Hoops 10 points adrift of leaders Rangers and three behind second-placed Motherwell, although Celtic have a game in hand over both.[LNB]The Parkhead club's stand-in skipper is looking to replicate the second-half performance in Ayrshire against the French side, who are above bottom side Celtic in the section only on goal difference.[LNB]"Due to the spirit we showed in the second-half against Kilmarnock, we are very positive and looking forward to tomorrow's game," he said.[LNB]"We are glad to be in Europe, it is a big game and very important.[LNB]"A win would be massive for us and we will be looking to win.[LNB]"I'm sure it will be a very difficult game but we will be doing our best to win and it will be a great boost to our season if we could do that."[LNB]Mulgrew insists the changing fortunes of the Old Firm on Saturday gives him belief that Celtic are far from out of the Scottish Premier League title race.[LNB]"It just shows everybody that anything can happen," said the former Aberdeen defender.[LNB]"Down to the last kick of the ball, anything can happen.[LNB]"There is a long way to go in the season and we have to keep that in our minds and be focused for 90 minutes in every game."