Paul Hartley has admitted that Gordon Strachan's transfer window signings have made a huge impression already at Celtic Park.

January new boys Barry Robson, Andreas Hinkel and Giorgos Samaras have played an important role in Celtic's improved form which has seen them score 13 goals in only three games.

"We've got a stronger squad and the manager bought very wisely in January. He brought in some excellent players so I definitely think we've got the players to cope with the run-in. Its far more satisfying to be playing well and winning and I think the fans are enjoying it. There's fierce competition here so you need to stay on top of things to keep your place in the team."

Hartley added that he expects the three remaining clashes with Rangers to decide the destination of the title.

"Everyone's already talking about the three Old Firm games deciding the title. There are a lot of big games between now and then but this is what it all comes down to."

Looking ahead to Wednesday's Champions League showdown with Barcelona, the midfielder says there's no reason to be afraid of the Spanish giants.

"Our home form is as good as anyone's in the Champions League so we fear no one these days. We can beat anyone on our day so we won't be afraid of Barcelona going into this one. They are a quality side but if we put in the same sort of performance as we did against Milan and Donetsk in the group stages then we've got a chance."

"These games are why you come to a side like Celtic."