Foster has helped the Baggies make an impressive start to the season, leading Clarke to declare that he deserves to be mentioned among the country's best stoppers.
"He's a little unorthodox yet he makes saves that maybe Cech wouldn't make. He's not a normal goalkeeper and has different ways of saving the ball.
"The bottom line is that he keeps the ball out of the net, and that's a great gift."
Foster retired from international football in May 2011 to focus on his club career, a decision that Clarke believes has improved his club form considerably.