Adelaide United say out of favour striker Sergio van Dijk may soon leave the A-League club.The Reds host Sydney FC on New Year's Eve at Hindmarsh Stadium with van Dijk again overlooked at selection.The 2010-11 Golden Boot winner has played just three games this season and told the club he wants to leave, with Indonesia or Thailand possible destinations."Sergy is still talking about Indonesia so hopefully we get some sort of answer to where he's headed in the next week or so," Reds coach John Kosmina told reporters on Sunday."The club have spoken to Serg and they are confidential (talks) ... it has been fairly open dialogue between the two parties."Serg has been quite open and said he wants to go for family reasons."Van Dijk's uncertain future comes as Adelaide try to return to the winner's list, having lost their past two games but still clinging to second spot on the ladder.But Kosmina suggested the recent defeats were beneficial."You have got to expect to lose games throughout the course of the season," Kosmina said."Not much has changed, the players are still the same players and I think the last couple of weeks will probably draw their focus back in."It is probably a better assessment of where we are as a group as well, how the way things have panned out the last couple of weeks."The season was almost going too well and maybe we needed a kick up the backside."Kosmina was impressed by Sydney in their upset win against ladder leaders Central Coast last start."They are a better team than they were when we played them five or six weeks ago, much better," he said.And he expected Sydney to adopt the same aggressive approach they showed against the Mariners."I don't see why not, if it worked against the Mariners they probably assume it would work against us as well," Kosmina said."But it's not about getting into fights with the opposition, it's about trying to outplay them."