Former Chelsea striker Tony Cascarino says Manchester United "have been sleepwalking for a long time".
Liverpool infamously endured a 30-year wait to clinch a league title before their success two seasons ago, while United have not been crowned English champions since Sir Alex Ferguson's last hurrah in the 2012/13 campaign.
Cascarino suspects the Red Devils' wait for domestic glory will persist just as it did for their bitter rivals, warning fans to lower their immediate expectations.
"There are so many things you have to get right and challenges for a football club to have success, and Manchester United feel like they've been sleepwalking for a long time," the former Republic of Ireland international told talkSPORT.
"It's not just on the playing side, it's all different aspects of the football club you've got to get spot on.
"Liverpool went through a similar period in the '90s and going into the 2000s, they were years without regularly winning things.
"They were always battling. They won the Champions League with Rafa Benitez and they won other other trophies with other managers, Gerard Houllier won a few.
"But they were not the Liverpool they are now – always challenging to win the league. Okay, they're a tad short from where Man City are right now, but they are competing to win it."
Cascarino believes the root of United's issues relates to their failure to appoint the right manager in the post-Ferguson era.
He added: "Sometimes it can take an eternity to get the right man in. Man United had a long time before Fergie, a time of stress and pain and changing the managers and a conveyor belt of players coming in and going out.
"Under Fergie, success for the football club was challenging to win titles, and they did – the Premier League and the Champions League – the top honour.
"But now it feels like success for Man United is just qualifying for the Champions League."
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