Ferguson could have had a debut goal but his low drive was kept out by Mark Flekken, and Scarles fired over late on as West Ham slipped to another defeat, their fourth in six matches since Potter took over.
West Ham were caught out on the counter-attack after just four minutes, with Bryan Mbeumo chasing Yoane Wissa’s ball over the top and getting in between centre-backs Maximilian Kilman and Konstantinos Mavropanos.
Kevin Schade’s early goal gave Brentford a 1-0 win at West Ham, with Graham Potter’s spell in charge yet to work its magic.
In a one-sided first half, Brentford scored after four minutes, had two goals disallowed and hit a post, with West Ham looking utterly powerless to stop them.
It was Schade’s 10th goal of the season, and the 10th time West Ham have conceded in the opening 10 minutes of a match.
