United have not won the Premier League since 2013
Ryan Giggs fears Manchester United's seven year wait for a Premier League title may go on for another 15 or 20 years.
United have not won the league since Sir Alex Ferguson's final season in 2012/13, with local rivals Manchester City winning three titles since and arch enemies Liverpool breaking their 30 year run without a league title last season.
"It could be 15, 20 years before you know it, especially if (Jurgen) Klopp and (Pep) Guardiola stick around," Giggs told Jamie Carragher, on
The Greatest Game podcast.
"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 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.
"Every manager and signing is seen as that he will win us the league and it's not like that."
Reflecting on his 22 years in a United shirt, Giggs recalled feeling at his best after beating Liverpool, regardless of how good they were at the time.
"The best feeling I always had was leaving Anfield after winning even if Liverpool weren't the best side at the time," said Giggs, who won the Premier League title a record 13 times while at United.
"I played for Salford boys and our toughest games were always against Bootle, Liverpool, Kirkby, Sefton.
"As soon as you went down the East Lancs it was a mindset it's going to be a tough game and a test of not just your footballing ability but also your mental strength."
