The shot stopper, 23, was solid and reliable in his recent outing at Rochdale as he continued his series of improved performances.
And Tisdale said: "He is someone who is very keen on learning and does everything he can to be the best he can be.
"His basics were extremely good. He was a very safe pair of hands."
Having had a three-game spell out of the side in October, Krysiak has continued to improve after replacing Rhys Evans in the starting line-up.
Tisdale believes he can only get better, and added: "I make no secret that I like to trust players and have faith in them.
"Young players are going to develop and there is going be a curve upwards in their performance level but it is going to go up and down. They are not going to play fantastically all the time."
- Sports & Recreation