Sheffield Wednesday defender Reda Johnson will miss Saturday's home game with Chesterfield as he is on international duty with Benin.
Johnson headed Wednesday's winner at Hartlepool on Saturday and his absence is a blow to manager Gary Megson, whose side have kept back-to-back clean sheets.
Megson must now make at least one change to his back four with Mark Reynolds and Julian Bennett vying to fill the gap at left-back.
Reynolds was an unused substitute at the weekend while Bennett was not included in the matchday squad.
Johnson will be joining up with Benin's squad this week for their African Nations' Cup qualifier against Rwanda on Sunday.