The former Manchester United captain was speaking on ITV
Roy Keane has laughed off Liverpool's hopes of success this season.
The Republic of Ireland assistant manager blasted their poor defending and believes it will hold them back domestically and in Europe this season.
Keane says there is no hope of Liverpool winning a trophy.
The Reds were held to a 2-2 draw in their Champions League group stage opener against Sevilla on Wednesday night.
Far from fearing the former European Cup winners, Keane says the top teams in Europe will be laughing at them.
He was speaking on ITV:
Liverpool win the Champions League? Forget about it says Roy Keane: pic.twitter.com/A4XUlmNUNE— ITV Football (@itvfootball) September 14, 2017
"Experienced players just switching off. It must drive the manager crazy as it's just schoolboy defending," Keane said.
"That is the easiest part of football, yet Liverpool can’t seem to do it.
"Win the league and Champions League? Liverpool? Forget about it. Later on, in the knockout stages against the Real Madrids and all these boys, they’ll be laughing at Liverpool."