Cherries boss Howe was given permission by the Football League to recruit the goalkeeper ahead of the League Two clash at Morecambe because of injuries to his two regular stoppers.
Howe, who revealed that both Shwan Jalal (calf) and Dan Thomas (back) were less than fully fit, acted quickly to snap up the Czech Republic youth international, who trained with Cherries last week.
Howe said: The grade one tear means Jalal is not going to be available.
Dan's back has been plaguing him for a couple of weeks and it has got to the stage where he's not fit either, so we had to bring Marek in.
The Echo revealed yesterday that Stech would be Howe's probable choice if he needed to recruit an emergency keeper.
See tomorrow's Echo for the full story.