Chelsea needed extra-time and penalties to unconvincingly scrape past second-tier Norwich and progress in the FA Cup, with Swansea and Wigan also securing safe passage to round four.
Premier League champions Chelsea labored for much of the game before eventually finding a way past their plucky opponents via a penalty shootout, despite a brilliant performance from the visitors.
The visitors grew more confident as the half went on, with Josh Murphy causing the Blues defence problems as the two teams went into the interval goalless.
Both sides hit the woodwork early on, with Danny Drinkwater striking the crossbar midway through the first half, and Nelson Oliveira latching onto an errant pass from Michy Batshuayi to crack a speculative effort onto the frame of the goal.