Against 10 men, the Reds looked to press home our advantage, with Pogba heading wide and then Rashford firing in an effort that tested Krul.
Ole threw Anthony Martial, the midweek hat-trick hero against Sheffield United, on as his sixth substitute to complement the already rich contingency of attacking resources on the pitch.
We continued to dominate proceedings and Pogba’s swerving effort forced a nervy stop from Krul, before Jamal Lewis stole the ball off Martial, with the Frenchman poised at the back post.
After the extra-time half-time break, it was Aarons’s turn to block a shot, this time from Rashford’s boot, and then Fernandes fired over from outside the area.
In 110th minute, Maguire looked to have sealed our passage to the semi-finals, but his crashing header was somehow tipped wide by Krul’s save – probably the Norwich keeper’s best of the evening. Minutes later, he was on hand to push Fernandes’s powerful strike past the post.
With penalties surely looming, our skipper popped up with the most timely of finishes right at the death as the relentless pressure finally told. He fastened onto Martial’s touch in the area and reacted quickest to the bouncing ball, before hooking it into the back of net. The strike wrapped up a 2-1 win and, to the relief of Solskjaer’s charges, secured our spot in the last four of the FA Cup.