Nigel Pearson admitted before the international break that centre-back Tomas Kalas has reached his "saturation point."
The Czech Republic defender, who has 28 caps, did not join the likes of Andi Weimann and Max O'Leary by heading off on international duty suggesting his groin injury was worse than initially feared.
Kalas, 28, has missed the last three games through injury after picking up a knock in the defeat at home to Birmingham City on March 5. Pearson then claimed Kalas was a doubt to play Blackburn in the following week but has been sidelined since with the manager determined not to rush him back into action.
