I'd imagine he's waiting on to see if they qualify for the Champions League again. If he feels they are in a position where they can qualify regularly and push on from that, then he'll probably sign a new deal. If they don't and struggle for players during the summer, he may well decide not to sign a new contract. In any case his contract doesn't run out for 2 and a bit seasons. I wouldn't say it's too much of a big deal until next season really.