That is according to Baggies goalkeeping coach Jonathan Gould.
Sitting rock-bottom of the Premier League has resulted in Foster copping a ton of goals. But Gould believes Foster remains in a state of progression.
"I think he can without a doubt," said Cutler, who joined from Walsall last month. "He's still got little details that I can work on and he can bring into his game can make him even better.
"He's so athletic, he's so quick around the goal, so powerful. If we can work on his shape a little bit more, which he's buying into, he can be even better.
"I'm trying to push him, I don't want him to coast, I don't want him to just be.
"At 35 you need to keep being tested, you don't want to come in and go home, you want to come in and learn something and develop."