Slory, 29, did not travel with his Adelaide team-mates to New Zealand at the weekend, with the two-time international left behind in favour of Ricardo da Silva instead.

Coolen deliberately snubbed Slory for the match and sparked the row with his reasons for the switch.

"Slory is fit and could have been available to join us in our squad," Coolen said last week.

"Ricky is much fitter then him (Slory), he has worked hard ...and we'll give him (da Silva) the opportunity to take over his (Slory's) position."

Slory has started just four matches this season and is now said to be unhappy at the club.

He had a meeting with Coolen on Monday afternoon to hammer out his future - but it's understood there was no agreement reached yet.

Afterwards a club insider insisted "at this stage Slory is still at the club" but admitted that may change in the next few days.

The former Feyenoord and West Bromwich Albion player has less than six months left on his contract and spoke to Coolen twice last week about his playing future before the meeting on Monday.

Coolen today discussed disciplinary issues with Slory amid reports the player has been late for training, his current state of mind as well as what Slory wants to get out of this season and beyond.

"I'm not sure (if Slory will stay) a lot of things are up to the player,'' Coolen told the Adelaide Advertiser.

"What he wants and how he sees his future. He has his own opinion and thoughts about it. At the moment it hasn't worked out very well.''

It's not the only worry for the Reds with defender Cassio to have follow-up scans on a foot injury on Tuesday.

Cassio was substituted in the first half of Adelaide's 1-1 draw with the Phoenix after rolling his ankle, but scans on Monday showed he had not broken any bones in his ankle.

He will now undergo an MRI which should determine if he has suffered ligament damage.