The player is obligated under contract to go on the tour.
If he didn't he would be breaching his contract and Forest could hit him financially.
It's pre-season and he is returning to fitness, in a January window he would be fit.
Above all he is being professional and making every effort to honour his contract, showing willing, and this means that Forest can't pull him up on any contractual issue.
If the deal is over we would move on to another target, it's obvious the deal is very much on, and we may be waiting to iron out an agreement with Forest.