"Naturally he might have less interest. But we never heard that he has less interest in captaincy. If he is skipper, then he has to play."
Rashid grabbed three of the remaining four wickets as Afghanistan took 17.2 overs on the fifth day to bowl out Bangladesh for 173.
The visitors -- playing only their third Test ever -- reduced Bangladesh to 136-6 before rain forced an early stump on the fourth day.
Debutant Zadran hit highest 87 off 208 balls for Afghanistan in the second innings while former skipper Afghan made 50 off 108 balls.
The major reason behind Nabi's decision to step away wasn’t stated but the decision might help him prolong his white-ball career
Rashid hit 51 off 61 balls to take Afghanistan to 342 in their first innings and then claimed 4-47 to leave Bangladesh struggling at 194 for eight.
Shah made 102 and put on a crucial 120-run fourth-wicket stand with Asghar Afghan, batting on 88, to counter the Bangladesh spin attack.
He becomes the youngest ever Test captain at 20 years and 350 days, overtaking Zimbabwe's Tatenda Taibu, who was eight days older.
The solitary Test match against Afghanistan will be Domingo's first assignment as the Bangladesh head coach.
Chris Gayle, Colin Munro, Daren Sammy, Munaf Patel among overseas stars for LPL auction
Sarfaraz Ahmed, Shan Masood, Haris Sohail among captains named for National T20 Cup
Galle Gladiators sign Shahid Afridi as icon player for Lanka Premier League
PSL 5 to return on November 14; all matches in Lahore
PSL Schedule Live Streaming and PSL 5 Matches Details
National T20 Cup: Salman Butt declines to lead Central Punjab second XI
Dawid Malan dethrones Babar Azam to become top-ranked T20I batsman
PCB finalises three-year broadcast deal with PTV
PCB announces major salary hike for domestic cricketers in new pay structure
'Team was already on a losing streak when I took over' - Misbah on Pakistan's T20I decline