Pepe Mel's men put another week to forget behind them as they fought back from behind to win 2-1 at relegation rivals Swansea on Saturday.
And ahead of next Saturday's trip to Hull, Foster told his club's official website: "We showed great team spirit to get the win.
"We need that every single game now and that has to be the standard for the rest of the season.
"We weren't willing to settle for a point. Three points was going to be a tough ask but we were definitely going to go for it."