According to BBC Sport, Newcastle will target Benitez if they sack head coach Steve McClaren.
I don’t think it would be the right move for him,” Mariner told ESPN FC. “I think it would be the right move for Newcastle because he is the type of manager that would get them very, very well organised.”
“I think it’s so important having come out of Real Madrid,” continued the former Arsenal forward. “His next position, his next decision where he’s going to coach is massive for him.”
“I don’t think Rafa needs this job,” added Mariner.
Newcastle are second from bottom in the Premier League table at the moment and are in real danger of getting relegated to the Championship at the end of the season.
The Magpies have a decent squad, but the players are severely underperforming at the moment.
While Benitez is a very good manager, he is not used to fighting for survival. The former Liverpool boss's most recent managerial job was at Real Madrid, the biggest club in the world.
It would be a huge step-down for Benitez to move to Newcastle, who could end up in the Championship at the end of the season.
The former Napoli coach has worked with the likes of Cristiano Ronaldo, Gareth Bale, Steve Gerrard and Xabi Alonso, and he could find it tricky to work with players who are not as gifted as them.