Southampton - Southampton needed a stoppage-time winner from Shane Long to book their place in the FA Cup fourth round at the expense of Norwich on Wednesday.
A forgettable first-half offered up very little in the way of goalmouth action, with the only real chance before the break seeing Canaries keeper Michael McGovern touch Sam McQueen's shot onto the post.
Claude Puel's side performed much better in the second half, however, as Ivo Pinto turned Josh Sims' cross around the post, while Jay Rodriguez threatened with a flick that went across the face of goal.
The visitors nearly took the lead on the break, though, when a swift passing move saw Kyle Lafferty fail to get anything on Josh Murphy's cross.
James Ward-Prowse then went close from a free-kick that only found the side-netting, before former Norwich winger Nathan Redmond livened things up off the bench.
Redmond was presented with three good chances to break the deadlock, but was unable to convert any of them. The first attempt was a weak shot from under his feet, while the second effort was easily saved by McGovern, before the wide-man failed to make clean contact as the ball rolled wide of the target from 12 yards out.
Redmond then created an opportunity for Long late on, but the Irish striker's header lacked any real power to McGovern.
Just as the clash appeared to be heading for another 30 minutes of football, Long rescued the Saints with a last-gasp winner. He forced McGovern to parry his header from close range but was on hand to slot home on the rebound, setting up a fourth-round date with Arsenal.