Liverpool attacker Roberto Firmino insists title favourites Manchester City are not invincible.

Liverpool, having dumped ­Pep Guardiola's side out of the Champions League last year, are perhaps the one club in England who won't be shaking in their boots.

“City are not invincible, they have lost games too," insisted Firmino to the Mirror.

“I think the battle for the title is going to be very tough and will go until the very last day. That's why we're ­determined to start at the top.

“The favourites are the usual ones – City, United, Chelsea and us. I don't think there will be any big surprises.

“But the Premier League is one of the toughest competitions in the world and so much of the battle is in the head. So, let's see what happens.

“All I can promise our supporters is that we will give every last drop and ­finish the season absolutely empty in a bid to win the title."