Koeman has warned that the centre-back needs to improve after his recent poor form.
The Tottenham Hotspur and Everton men were questionable on Tuesday.
Everton were beaten 5-0 by Chelsea at Stamford Bridge on Saturday.
Everton travel to Stamford Bridge to take on Chelsea this afternoon.
Ramiro Funes Mori started ahead of Phil Jagielka in Everton's last match against West Ham United.
The Saints striker came up against Everton's number 6 while at QPR two seasons ago.
Manchester United’s Wayne Rooney has been linked with a move to Everton.
Sheffield United have sold some quality players over the years, here's what their starting XI could look like now if they hadn't.
Having moved to Everton in the summer, Ashley Williams has formed a strong partnership with Phil Jagielka.
The England international again had a poor game in the Premier League.
Everton were beaten 1-0 by Bournemouth on Saturday afternoon.
Fourteen years ago Sheffield United endured one of the longest and most dramatic seasons in English football history and this is how it happened.
A petition has been launched to halt the possible transfer of Lamine Kone from Sunderland to Everton as Ronald Koeman looks to strengthen his squad.