The new deal will keep the Polish keeper at Old Trafford until 2012.
He said: “For the club to offer me an extension when I still have two years left shows the trust and support that I have from the club and Sir Alex Ferguson.
“I am so happy as I have had a great time so far but there is still so much to prove and I want to continue working hard to ensure my position within this great team.”
United manager Sir Alex Ferguson added: “We always like to sit down with all our young players as we want to look ahead and protect our future.
“Top goalkeepers are hard to find and I believe we have three of the best here and by securing Tomasz’s future we can consolidate ours.”
