Celtic take on Dundee on Sunday not knowing quite yet if it will be a match that can secure the league title or not. Aberdeen take on Hearts on Saturday and if the Dons lose then it opens the door for Brendan Rodgers' side to clinch a sixth successive league title at Dens Park.

That would be a big motivating factor ahead of the game but with the league pretty much signed, sealed and delivered regardless of this weekend's results, the Hoops are likely treating their preparation for this match like any other.

What's also at stake is Celtic's unbeaten domestic record. We've been writing this for months now but incredible Brendan Rodgers' side have still not been defeated in domestic football. Perhaps more remarkably, they've only drawn twice.

That record is at risk on Sunday and with every side between now and the end of the season desperate to be the team that bursts the bubble, it gets tougher and tougher to maintain the record. Dundee are no different and will be right up for this one in front of their own fans.

Here are three reasons why it might not all go to plan for Celtic this weekend...

Marcus Haber

Dundee's top scorer this season, Marcus Haber knows how to find the net against Celtic. He was the man who gave the Dees a glimmer of hope at Celtic Park earlier in the season and is their key danger man again on Sunday.

With six goals this season and three assists, he's been a vital part of Paul Hartley's attack. He also gets more than half of his shots on target, meaning Celtic can't give him too much space in the final third or risk him testing Craig Gordon.

He's not the only threat Dundee have with the bright Mark O'Hara shining in recent weeks, perhaps most notably against Rangers when he netted to give the Dark Blues their first league victory over the Gers since 1992.

The tight games between the sides this season

Dundee have been one of the teams that have competed most capably with Celtic this season, seemingly able to put up a sturdy defence and deny the Hoops goalscoring opportunities more than other top-flight sides.

Celtic have won both games but they were very narrow victories with the Dees losing 2-1 at Celtic Park and in the last match at Dens falling to a 1-0 defeat.

The match before that last season ended 0-0, highlighting that there's something about Paul Hartley's team that the Bhoys don't like coming up against.

That could be a problem on Sunday again with Dundee not quite completely safe from relegation and the fact they have a big TV game at home providing extra motivation to impress.

Derby hangover

Last weekend's result was a blow to Celtic. Up until that point they had looked invincible, with many predicting they would rack up another heavy scoreline against their city rivals.

While they are still undefeated of course, it was a poor performance and one which must be improved upon on Sunday, or anything can happen.

Dundee have recently beaten Rangers of course so can raise their game when the time calls and it's up to Celtic that they are no wounded animal right now.

There's every chance the result at home to Rangers provokes a response from Brendan Rodgers' side but with their goals for the season almost already met, it could be hard to keep the motivation levels high enough to not suffer their first big lapse of the season.