The former Liverpool star doesn't appear to be the biggest fan of his old boss.
Babel was signed by the Spaniard while on Merseyside in the summer of 2007 for £11.5 million, per the BBC, and spent three seasons working under him.
It was confirmed today that Benitez will leave his post at Serie A side Napoli, as covered by the Daily Mail, with speculation continuing to gather pace that he will be installed at the Bernabeu, with some bookmakers pricing him as short as 1/33 to take that post.
Here is what Babel said on twitter:
Benitez on his way to Real? He will make Ronaldo a great defender...— Ryan Babel (@Ryanbabel) May 28, 2015
A sign of the way Liverpool typically played under Benitez was that he liked everybody to do their shift when it came to defending, even if they were more renowned for their attacking capabilities, but everywhere he has gone he has shown is capable of delivering success.
Babel - who currently plays in the Turkish league for Kasimpaşa - clearly wasn't a fan of working under his old boss, and ended up leaving the club six months later after a brief spell starting as a main striker under Roy Hodgson, but didn't impress Kenny Dalglish following Hodgson's sacking.
The Dutchman was often criticised for not making enough of an impact when he was handed a start, with many of his more memorable performances coming when he was used from the bench - and often deployed as a winger.
Cristiano Ronaldo is regarded as one of, if not the best player in the world as he continues to break goalscoring records at Real. Benitez might expect some more defensive work from him, but the Spaniard is likely to recognise the talents of the Portuguese star and allow him to retain the role he currently has within the side.