Liverpool legend Jamie Carragher was disappointed with their tactics for their 0-0 draw with Manchester United.

David de Gea made a superb stop to deny Joel Matip in the first half, with Emre Can having Liverpool 's best opportunity of the second period.

"Jurgen Klopp made changes but he still kept the three-man midfield the same," he told Sky Sports.

"Manchester United showed such a lack of ambition, it was worth taking a risk by leaving Coutinho on and bringing on another attacking player.

"Yes, you can get done on the counter but it was obvious United were here for a 0-0 and hoping to nick a goal from a set-piece or a counter-attack.

"I think Liverpool should have taken the risk to take (Gini) Wijnaldum or Can off.

"It's not easy as a manager but I'd have taken that chance earlier and the substitutions shouldn't have been just player for player, but more tactical.

"It would have given Liverpool an extra attacking player on the pitch - it could have cost them the game, but it could have won them the game - but the position Liverpool are in, it was a game they had to go for."