Crouch has advised the duo to get out whilst they can.
He told the : “Not many young players made an impression on me like Ruben Loftus-Cheek last season.
"I played against him twice and the second time, in particular, stands out. He was like a machine, a big, strong powerful lad who could burst away from you in a flash.
“I want to see him do well and become a big player in the Premier League, as well as for England so it was disappointing to read comments this week in which he said Maurizio Sarri has told him he needs to understand the game before he can get into Chelsea's team.
“This is the problem all young players are facing now and I'm not sure it's a problem that is going to be solved any time soon. In order to get to the top, Loftus-Cheek needs prolonged experience in teams who are playing at the top.
“Joe Allen, my team-mate at Stoke, has been raving about Ampadu and you could see why when he played against the Republic of Ireland in Cardiff."