Wilk's signed 2 Jul apparently or maybe the day before. They must have known then that they were likely to go down, so I would assume that his contract will have been based on a wage for Div 1 and in the unlikely event that we stayed up then a wage for the Championship.
As we are not a party to the what the contract says, then it is pure speculation of cause, but I cannot see why it would be worded in an away that there was a relegation clause in it, just a wage level for whichever league we found ourselves in.
I think it will purely come down to Ehab accepting a bid if this figure of £1.2m I've seen bandied about is true, then if they paid say £500k for him, Ehab may take the money and let him leave, if the player agrees.
If Ehab handles it has he did with Henrikson, then anything can happen!