The Belgian's leg had become infected and the right-back now faces an extended spell on the sidelines but City manager Nigel Pearson revealed it might have been much worse for him.
"A simple knock on it and he could have been out for the rest of the season," said Pearson.
"It is important that our concern is chiefly with the player's wellbeing.
"He needs to get it sorted, but he is well on the way to recovering now. Hopefully it won't be too many weeks, but it will be a month or so."
De Laet made the move to the King Power Stadium from Manchester United in the summer of 2012 and has made 12 appearances for Leicester this season, although he missed Saturday's 2-1 Championship win over Huddersfield.