Los Angeles Galaxy have slipped to sixth in the MLS Western Conference after being held to a goalless draw by Portland Timbers at the Home Depot Centre.

Bruce Arena's men needed a win to go back above Vancouver Whitecaps, who defeated Chivas USA 3-1.

However, it turned out to be a frustrating night for the Californian side, as Gyasi Zardes squandered a number of golden opportunities.

The closest the forward came was when he saw his header come back off the woodwork five minutes after half time, and there was to be no breakthrough for the Galaxy.

The result sees Portland draw level on 27 points with second-placed Real Salt Lake.