The 36-year-old joined the Championship club in the summer.
Wolverhampton Wanderers reportedly join the race to sign the Tottenham Hotspur man.
Aston Villa's Adama Traore is currently out injured.
Benitez wants more clean sheets and to concede fewer chances in the season ahead.
Jeremain Lens has been linked with a move away from Sunderland in recent times.
Aston Villa midfielder Idrissa Gueye could be set to join Everton.
Everton are reportedly interested in Stoke City winger Marko Arnautovic
The Leeds United coach is impressed by the 18-year-old.
Mane said he will not fall foul of any discipline breach following last season's experience at Southampton.
Roger Federer will miss the Olympic Games in Rio and the rest of the tennis season, including the US Open, in order to recover from knee surgery.