Adelaide United playmaker Dario Vidosic's recurrence of a hamstring injury is bad luck rather than bad management, Reds coach John Kosmina says.

Vidosic will miss Friday night's A-League fixture against Western Sydney Wanderers after limping off at Adelaide's match-eve training session.

Kosmina was uncertain how long Vidosic will be sidelined by the latest flare-up of an injury which has troubled the gifted attacker for the past year.

"We have got to get it fixed ... I want to make sure he is fit before we use him again, it's as simple as that," Kosmina told reporters on Thursday.

"We will get it cleared up - it has recurred, so we have got to look at why it's recurring."