Mustafiz sustained external head injury during a practice session of his team at the Zahur Ahmed Chowdhury Stadium in Chattogram on Sunday afternoon.
The incident took place when Mustafizur was going to the bowling end at the nets to start for a new ball but at that moment, a ball struck by Liton Das from the batsman's end hit Mustafizur's head.
Mustafiz has taken 11 wickets in nine matches in the ongoing Bangladesh Premier League (BPL) so far for Comilla.
Comilla, which are currently in the second position in the points table with 14 points, will face Sylhet Strikers in their next game at the Zahur Ahmed Chowdhury Stadium in Chattogram on Monday.