Swansea City are reportedly looking to replace Francesco Guidolin with Gianfranco Zola.
With Arthur Masuaku injured the Peruvian could be an option.
Tottenham star is the latest to renew his contract.
Arsenal host Chelsea at the Emirates on Saturday afternoon.
Koeman has made it clear that Niasse will not feature in Everton's first team squad.
The Saints travel to the London Stadium on Sunday.
Newcastle take on Aston Villa in the Championship on Saturday evening.
Sunderland face Crystal Palace in the Premier League this weekend.
The Frenchman has been discussing the striker's current injury battle.
The Swedish defender has been in excellent form for Leeds United recently.