The Red Devils have relied upon the England international in a left-back role throughout the 2017-18 season.
Jose Mourinho has been reluctant to rely upon Luke Shaw at full-back given the 22-year-old’s inconsistent performances.
Young has benefited from the Portuguese head coach’s reluctance to use the England starlet in his starting XI.
The 32-year-old has scored two goals and has made four assists in 30 appearances in the Premier League this season.
Young was part of the Manchester United squad that won the Premier League title with two games to spare last term.
Manchester United have been linked with a potential swoop for a top left-back this summer, such as Tottenham Hotspur star Danny Rose.
However, former Spurs forward Crooks heaped praise on Young for his impressive performances in the current campaign.
“I thought this lad was finished at Manchester United but that couldn’t have been further from the truth,” Crooks told BBC Sport.
“United have converted yet another winger into a very competent full-back. First Antonio Valencia, now Ashley Young.
“The England international was beginning to create a reputation for himself when it was alleged he would go looking for penalties in the days when he was a winger.
“He appears to have adapted his game and concentrated on becoming a permanent fixture in United’s defensive line-up.
“His performances have also earned him a recall into the England set-up at 32 years of age. Not bad for a player I had written off.”
Manchester United finished in second place in the Premier League table this term ahead of Liverpool FC and Tottenham Hotspur.
The Red Devils will take on Chelsea FC in the FA Cup final at Wembley next weekend in pursuit of a third title in two season under Mourinho.
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