The former Barnsley defender has enjoyed an impressive breakthrough season at the Liberty Stadium after making 14 appearances in the Premier League.
Under manager Paul Clement, he has played a crucial role at both ends of the pitch as he has also bagged three goals.
He scored a stunning volley in the win over Leicester City last time out and Fabianski has also been impressed with his defensive displays.
Fabianski said: "Alfie has been a real plus for us – his defending, his quality on the ball, his goals.
"He is a very important figure on the pitch. He’s a very good defender and is comfortable on the ball. It’s his first season in the Premier League but you can see he is improving with every single game.
"His goals have been very important for us – they all came in victories – but it his defending that has really pleased me."