The Baggies will be looking for their first win of 2013 when they visit Everton for Wednesday night's Barclays Premier League encounter.
West Brom have collected only one point from their last four league games and crashed out of the FA Cup to QPR in a third-round replay.
But Foster is refusing to press the panic button and believes Steve Clarke's side will soon get back on track.
The former England international said: "The performances have been good. We've carried on what we've been doing. It's just the results have changed.
"If you look at the last four or five games we've been unlucky, even going back to Manchester United when we lost 2-0 and they know they'd been in a very good game.
"We deserved at least a point from the Fulham game, if not three. As for Reading, it was crazy, ridiculous after leading 2-0.
"For 83 minutes we were amazing, passing and defending well, just a pleasure to watch, and we lose 3-2.
"I don't think we are reading too much into it. The spirit is still there."