Former Rangers winger Liam Burt announced his Old Firm switch in style by earning Celtic Colts a shootout win.
The Hoops revealed just 15 minutes before their Challenge Cup clash with Queen’s Park that the 20-year-old had signed a two-year deal.
And Burt, released by Rangers this summer, buried the decisive spot-kick having come off the bench for his competitive debut in their 2-2 draw.
Jack Aitchison and Armstrong Okoflex had the Hoops two up by the half-hour in Airdrie.
Salim Kouider-Aissa’s low drive halved Celts’ cushion before half-time and the Spiders thought they should have had a penalty when Adam Martin tumbled.
But the League Two side would not be denied as Martin buried a cross ball with 18 minutes left, after which Burt was brought on and went on to seal a 4-3 success.
Rangers Colts are also through after a 2-1 win at Berwick. Dapo Mebude and Josh McPake’s tidy finish putting them in command by half-time.
The Shielfield side lost Yaw Osei to a straight red after a clumsy tackle on Jamie Barjonas but Dan Purves pulled a goal back.
Hibs defender Ryan Porteous returned from seven months out with a knee injury but the Under-21s still lost 4-3 to Elgin.
Porteous headed home and Jamie Gullan found the net either side of Kane Hester’s leveller.
Shane Sutherland and Hester put City 3-2 up only for Oli Shaw’s spot-kick to restore parity 12 minutes from time. Elgin sub Matthew Cooper put paid to that in injury time. Aidan Keena scored twice as Hearts’ Under-21’s beat Albion Rovers 4-1 but Kilmarnock’s kids lost 4-0 to Kelty Hearts.
Aberdeen’s kids were thumped 6-0 by Brora Rangers after five second-half goals. Mark Nicolson started the rout 11 minutes in as Scott Davidson, Bjorn Wagenaar, Dale Gillespie, Kyle MacLeod and Colin Williamson sealed a hammering off the Highland League side.
Cammy Breadner’s 25-yarder saw St Mirren’s Under-21s edge out East Kilbride 1-0 as team-mate Dean Lyness saved a Sean Winter penalty.
Mitch Megginson made it five goals in three games as his single helped Cove hammer St Johnstone’s Colts 4-1.
Davis Keillor-Dunn’s free-kick was decisive in Ross County’s 3-2 win over Fraserburgh after Staggies’ Joel Macbeath saw red.
