The former England man insists the Baggies have shown their battling qualities recently, after heartbreaking defeats in consecutive games against Manchester City and Newcastle
Papiss Cisse's fortunate 94th-minute strike condemned the Baggies to a cruel defeat at St James' Park on Sunday, but the former England shot-stopper claims the performances put in by the club prove their credentials.
“We showed that we have spirit," Foster told the club's official website.
“We deserved to get at least a point if not three against Manchester City and to bounce back as we did at Newcastle, against a very good team, shows that it won’t get us down.
“We will keep on playing the way we know we can.
“The gaffer said in the changing rooms that as long as we keep on playing like that we will win a lot more games than we lose. And he is damn right.
“We’ve got to look to the next game now and Southampton on Monday night is a game we would expect to get something from with the way we’ve been playing.
“We played really well against City and then again at Newcastle, and Southampton will know they’ve been in a game.
“We hustled and harassed Newcastle and didn’t give them a second on the ball and we’ve just got to put it behind us and move on.”
Foster also spoke glowingly about new Baggies boss Steve Clarke, hailing the Scot's direct approach as crucial to the side's early-season success.
“The gaffer has been great. He just tells it how it is and the lads appreciate that," Foster added.
“He doesn’t sugar-coat things or try and con you, he just tells it how it is. We’ve got an experienced team and if he was trying to con you then you wouldn’t buy it.
"He knows we played well on Sunday and everybody gave 110 per cent, and he couldn’t ask any more of us.”