The former Manchester City keeper was one of United's outstanding players in the first month of the term and the current interlude in the season has given him a fortnight to reach full fitness and begin the fight to regain his first-team place from Shane Higgs.
Simon Grayson said: "Kasper's doing a little bit of goalkeeping work, but he's sore with his tendon. He still has a boot on and he's doing some handling work. The injury just needs time to heal.
"We had to be careful because if he'd continued playing, he could have had quite some time out. The injury isn't a serious thing but it could be a problem if we overload him with work."