The Rangers full-back has long been linked with a move to Liverpool.
“I’ve been playing in the reserves at Liverpool for the past four months and the majority of that team are internationals,” Cooper told the Daily Record.
“There are only three or four British boys in the squad and the rest are European and South American players – from countries such as France, Iceland and Argentina.
“It’s a great experience to play alongside them, you’re mixing it with good players all the time.
“I’m certain if Danny came down he’d enjoy himself.
“I first heard about Danny coming here when one of my friends told me Liverpool were in for him. I played with him for Scotland’s U17 side a few years ago and always thought he was a good player.
“I’m not surprised Liverpool are interested in him. All I would say to him is, it’s great down here and the standard of player is very high.
“The facilities and the academy at Liverpool are brilliant. It’s huge and I’ve yet to see anything better than we’ve got. The Melwood training ground is second to none.
“All the young players come from different places around the world but I think that has actually brought us all together. We have a great team spirit in the camp.
“I haven’t spoke to Danny recently but I rate him very highly and think he’d do very well at Liverpool. It won’t surprise me if he comes and starts challenging for a place in the first team.
“However, there are a lot of top-quality youngsters around so it won’t be easy for him.
“If I was to speak to him and he was undecided, I’d definitely tell him to go for it.
“I know he’s achieved a lot at Rangers this season but I’m thoroughly enjoying my time here.”