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.
Middlesbrough will face Tottenham Hotspur in the Premier League this weekend.
Everton will head into the new Premier League season under new ownership and management and Manchester United's Daley Blind would be the perfect signing.
Middlesbrough are back among England's elite after achieving promotion to the Premier League.
France take on Iceland and players linked with Manchester United, Leicester and Tottenham are in action