The Austrian centre-back spent three years at Real Madrid and has been critical of the lavish lifestyle that some of the club's youngsters had during his time there.
"I was surprised to see under-17 players walking around with 500 euro toiletry bags," Lienhart said in an interview with Transfermarkt when asked about his time at Real Madrid.
"I don't think that's necessary... I think it's not good when a young player earns so much money, he can lose sight of what's really important in his career. That's how you lose a lot of young talents."
"It's a very big jump. I would have to progress more for it to be possible," Lienhart explained.
"It would be good to have the opportunity to return. It was a great experience and I wouldn't say no to a possible return."