Bangladesh debutant Yasir Ali has been under 24-hour observation in hospital  after he was hurt on his helmet by a nasty bouncer off Shaheen Afridi and suffered a concussion, confirmed the media department of the Bangladesh Cricket Board (BCB) on Monday afternoon. Yasir got the blow in the 30th over in the morning session of day four of the ongoing Chattogram Test between Bangladesh and Pakistan. Right after the blow, Yasir called back to the dressing room and was sent to the hospital for a quick scan. Read: Chattogram Test: Bangladesh set a target of 202 for Pakistan “The scan has found no collection and he is medically stable. However, as a precaution, he will be observed for 24 hours at the hospital,” the BCB statement read. Yasir will not take part in the ongoing match. He was Nurul Hasan Sohan as a concussion substitute.  It was the debut Test for Yasir, and he scored 36 in the second innings before retiring out.  Replacement Nurul hit 15. In the fourth innings of the match, Pakistan are batting to chase down a target of 202 to seal the game.