Ryan Giggs has warned Manchester United that it could take between 10 and 15 years for them to be in contention to win the Premier League again.
United remain the most dominant side in the history of the English top flight with 20 titles, with Liverpool in behind on 19.
However, they have not won the Premier League since Sir Alex Ferguson's last season in charge in the 2013/14 campaign.
Since then, they have gone through several managers - David Moyes, Louis van Gaal, Jose Mourinho, and now Ole Gunnar Solskjaer, but have never come close to replicating previous successes.
Since 2014, Man City have won the league three times, Chelsea twice, while Liverpool won their first ever Premier League title in 2020 to take them to 19 overall top division titles. One more and they will equal Man Utd's record.
Giggs, who also took charge of United for a short spell as caretaker manager after Moyes was sacked, thinks the club face a similar wait for success like the one Liverpool had to endure.
"Yes, 100 per cent," Giggs told the Greatest Game Podcast when asked if he feared the drought would continue
"It could be 15, 20 years before you know it, especially if [Jurgen] Klopp and [Pep] Guardiola stick around.
"They have got the resources and the players so we have Liverpool to look at, where the last time when they won it in 1990. They thought 'we'll win it again soon.'
"Even Klopp, it took four-and-a-half years for him to win it - it takes a long time.
"You have to think about what Klopp did.
"He improved the team every season or won a trophy like the Champions League and then you saw the improvement so the pressure was off a little bit.
The former United captain reckons that patience is key for the Old Trafford side now, and that instant success cannot be expected of whatever manager is in place.
"Every manager and signing [for United] is seen as that 'he will win us the league' and it's not like that," he added.
After their opening five matches of the 2020/21 campaign, United are currently down in 15th, having accumulated seven points so far.