Benitez has come under increasing pressure at Anfield following a poor season so far.
Whelan said: “Rafa should have gone a long time ago. They have got to do it now.
“The way Liverpool have been playing, they have not been good. They have lost 10 of the last 20 games.
“Do they bring in someone until the end of the season? Kenny Dalglish is back at the football club. Could he do it until the end of the season and see what happens?”
