Adelaide Utd must stay positive: Valkanis Adelaide United coach Michael Valkanis has urged his players to remain positive despite a linesman's blunder all but dashing their hopes of a top two A-League finish. The Reds drew 1-1 with Newcastle Jets on Friday night at Hindmarsh Stadium, the point securing a home final in Adelaide. But United, who can finish no lower than fourth, were wrongly denied a 91st minute winner to Dario Vidosic, whose sweetly struck goal was cancelled by an incorrect offside ruling. The Reds had harboured hopes of catching second-placed Central Coast. But now, for that to happen, Adelaide must win their two remaining matches and the Mariners not collect any points from their final three games. "They (Adelaide players) are just bitterly disappointed about not having the three points because in the end, internally, we're striving still to finish second," Valkanis said. Valkanis had no doubt the controversial call was wrong. We were celebrating. We thought we had won the game," he said. Looking at the replay, I can't see the offside and how it was offside. It's one of those moments I'm glad I'm not a linesman or referee. But we can't do anything about that now. That has been done. We have just got to be positive.