Manchester United's Ecuadorian winger, Antonio Valencia, said it would be "pain for months" if former Red Devils striker Carlos Tevez scored the winner for his club's title rivals Manchester City, when the two sides meet on 30 April.
The two clubs from Manchester are neck-and-neck in the race for the league crown this season and April's game at the Etihad could well decide what colour the city will be painted at the end of the campaign - red or blue.
United and City are level on points for now (although Sir Alex Ferguson's side has a game in hand) and Valencia knows the local derby will be of crucial importance.
Meanwhile, United's boss has picked out Valencia as the key in United's bid to defend the Championship. Ferguson pointed out the impact that Tevez, who was restored to City's first team after a six-month argument with manager Roberto Mancini - Tevez came on as a second half substitute against Chelsea and set up Samir Nasri's late winner.
"If Carlos plays against us, I'm sure he'll be motivated. He's an excellent player, able to change a match in an instant. What he did against Chelsea was no surprise," the Sun quoted Valencia as saying.
"But for Tevez to score the winner? I hope it doesn't happen. And for us to fail and lose the title will bring pain for months. But I'm confident in my team," the Ecuadorian added.