Foster knows that West Brom fans have not had much to shout about this season, yet they have never wavered in their support during home games.
"When you consider the way the weather was leading up to the game it really is incredible support," he said to the Express and Star.
"I know they struggled to get out of the Midlands, on to the motorways, and down to Watford so I'm really grateful they went to such effort to support us.
"Yet again they stayed behind to clap us at the full-time whistle. They were singing their hearts out.
"It's absolutely brilliant and we really couldn't ask for any more from them.
"I think they can appreciate we're trying and we're giving we have got.
"It's really nice to have the fans getting behind us."