The 18-year-old Chelsea player didn't make it on to the scoresheet in this qualifying round tie but he was the focal point for Sbragia's side as they scored four goals in 19 second-half minutes to take a giant step towards qualification for the elite round of the 2013 European Championships.
With the other two sides in this group, Switzerland and Romania, playing out a 1-1 draw at the Falkirk Stadium, victory for Scotland against the Romanians tomorrow night would guarantee them the right to contest a place in next summer's continental finals in Lithuania.
The goals were shared out between Celtic's Joe Chalmers, Everton kid Matthew Kennedy, and Rangers duo Barrie MacKay and Lewis MacLeod, but Sbragia said Feruz had deserved a goal for his display up front.
"I thought Islam was outstanding tonight and this was probably the best game he has played for us," said a clearly delighted Sbragia.
"He'd good movement, good body strength, and I really wish he had got a goal because he deserved it after that display.
"But the team won and he made a great goal for Kennedy. I was really pleased for him."
If Feruz was the headline act last night, he had plenty of competition. With Aberdeen's Ryan Fraser, the current SPL young player of the month, an unused sub, Sbragia had the privilege of fielding players with first team experience at both Celtic and Rangers.
The 18-year-old former Celtic youngster could have had four goals before the first half was out, missing a couple of chances before rattling the crossbar.
But Chalmers had no such difficulties with a free-kick of which Charlie Mulgrew would have been proud.
Kennedy, a winger who did enough at Kilmarnock to impress David Moyes at Everton, got the second after Feruz had outrageously wriggled past three defenders on the right-hand touchline, before a left-foot curler from MacKay and right-foot drive from MacLeod put Scotland onto easy street.
It was a tactical success for Sbragia, who hadn't been amused with the first half.
"I wasn't happy at half-time because we were too deep, and too open as a team," he said.
"If we had played the way we did in the first half against a better team we could have been one or two down.
"I might have preferred it if one of the other teams had won. But we know we have to beat Romania now."