Wayne Rooney claims Manchester United's stunning fightback at Chelsea on Sunday fired a warning to their title rivals Manchester City.
The England international forward was delighted at the way the Red Devils stormed back from a three-goal deficit after 55 minutes at Stamford Bridge to secure a share of the spoils.
Rooney, who scored two of United's goals from the penalty spot before Javier Hernandez's late header levelled matters, believes Premier League leaders City will have been disheartened by their comeback and also proves that they are ready to scrap to retain their championship crown.
"Of course it's two points lost, we understand that, but after being 3-0 down all the City players at home won't enjoy watching us, the way we fought back and the spirit of the team," Rooney said.
"They know it will be a long fight to the end and we'll be there to the end.
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From the start we controlled the game and we were unfortunate to go in 1-0 down, then in the second half they hit us with two goals in five minutes and we knew we had to dig in.
"We knew if we got one goal there was time to get something out of the game. We fought well and fought hard and that point could win us the league.
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A lot of teams would find it easy to put their heads down and accept defeat but we carried on, worked hard and thankfully got something out of the game."