Aberdeen manager Craig Brown is looking for his side to give themselves a huge mid-season boost by beating Celtic on Saturday.
The Dons go into the Pittodrie game just a point behind Celtic after losing just once in the Clydesdale Bank Premier League since their opening-day defeat at Parkhead.
Celtic have lost to St Johnstone and Kilmarnock this season around the time of their Champions League games and face Benfica on Tuesday in Lisbon.
Brown said: "The mental factor is important. Kilmarnock and St Johnstone have done it. The publicity, the boost the clubs got, and the psychological boost, you can't measure that, not just for the players but the fans too.
"I'm still convinced Celtic have the best team and the best squad so if we do it it will be an achievement."
With Celtic falling behind Hibernian at the top of the SPL, supporters around the country are hoping that there can be a genuine title challenge to Neil Lennon's men. But Brown is refusing to get carried away.
"The league has a long way to go. If we were here with half a dozen games left we would be really in with an outstanding chance," he said.
"We still are, I'm not denying that. To be in touch with Celtic who are champions-elect in my book is good. But we have to get a victory on Saturday to stay where we are or at least not lose the game.
"We are not going out on Saturday with the 'not lose' mentality. We are going out thinking with home support, with us being on a good run of form without being brilliant and therefore we are going to try to win the game."
- Sports & Recreation
- Clydesdale Bank Premier League