Tottenham manager Harry Redknapp believes the Carlos Tevez row could halt Manchester City's Premier League title push.
The Argentine caused a stir this week when he allegedly refused to come on as a substitute in his side's UEFA Champions League clash at Bayern Munich.
Tevez has since been suspended by the club pending a full investigation into his actions, while manager Roberto Mancini claimed, in his post-match comments, that the striker's career at Manchester City was 'finished'.
Despite an unrewarding start to their Champions League campaign, City are joint-top in the Premier League table, trailing rivals Manchester United only by goal difference.
They face Blackburn on Saturday hoping to maintain their unbeaten start to their domestic campaign.
Spurs, meanwhile, are aiming for a Champions League spot this season and, after three wins in a row, are sixth in the table with their last top-flight defeat being a 5-1 hammering by Mancini's City.
But Redknapp believes the public spat could significantly affect the title race.
He said: "If you're Manchester United or Chelsea and you're thinking about winning the league, you feel more confident today because you look at that and it's damaged Manchester City football club.
"And the manager doesn't deserve that.
"It was unbelievable. I felt sorry for Roberto Mancini to be put in that situation. It's not fair.
"It wasn't right for Man City, wasn't right for football. It shouldn't believe it. It can't happen.
"I just wonder what City legends like Malcolm Allison and Mike Summerbee would have thought of seeing a player refuse to play on a Champions League game. It is beyond belief.
"If someone says warm up, you warm up. You don't even have to say anything."