Welbeck swooped for a crucial equaliser.
Welbeck said: "We were delighted to get the goal at the end. "We created quite a few chances in the second half and we got more possession.
"Maybe if we stick away a few more of our chances, we can progress."
The equaliser was set up by Tottenham fullback Kyle Walker, who was a surprise starter at right-back but fully justified his selection.
Welbeck said: "Kyle was magnificent all game bombing down the right wing and we knew that once he gets into the box he's going to look for a pass.
"That's what he did and thankfully he found me and I just turned and found the net."
He added: "Every point counts so we're looking to build on that platform now and progress to the semi-final."