Jack off the mark at Leiston.The pair are initially with Leiston for a month.
Nnamdi Nwachuku, who also joined Leiston on loan last week, played ninety minutes on Tuesday night as he too gets some match action under his belt.
It was the second successive victory for Leiston since former U's midfielder and current U's academy coach Steve Ball returned to the club to take over the managerial reins.
Jack slotted home from a corner for the Suffolk team, to help them to a 5-2 win over Bognor Regis.
U's youngster Jack Simmons was on target for loan club Leiston on Tuesday night in the second game of his loan spell with the Ryman Premier League club.