Barcelona are rumoured to be monitoring Mascherano's situation, but Benitez says he is keen to see the player remain on Merseyside.
"Mascherano wants to stay, he is very happy here," Benitez told the Liverpool Post.
"He is a key player for us and I have been talking with him and he is really pleased to be at Liverpool.
"His family are settled here and his wife is learning English and he is very comfortable here.
"Javier also knows that the supporters like him and I think if everything is okay he will stay with us.
"We are happy with him so it would be good for everyone if he stayed at Liverpool."