The Slovenia international sustained a hamstring injury in last Saturday's defeat to Middlesbrough and missed Monday's draw at QPR.
Providing Koren does not suffer any reaction he will return to the Tigers' midfield, but on-loan defender Corry Evans is definitely out.
The Manchester United centre-half sustained a hamstring injury at QPR and will miss out, as will Liam Rosenior, who will play no part in the final two games due to medial knee ligament damage.
Midfielder Nick Barmby (calf) remains sidelined and goalkeeper Vito Mannone is ruled out with a damaged shoulder, so Matt Duke will continue in goal.
David Amoo could make his full debut after scoring the equaliser at QPR as the Tigers who can still mathematically finish in the top six.
Source: PA
Source: PA