A hectic evening of League Cup action threatened to provide a host of upsets, yet Watford was the only Premier League team knocked out.
Watford was the only top-flight team to be knocked out in Tuesday's League Cup second-round matches, but Stoke City, West Brom, Aston Villa and Crystal Palace were all given scares by lower-league opposition.
Premier League newcomer Watford suffered a 1-0 defeat at Championship side Preston — Marnick Vermijl's early goal settling matters — and also saw Miguel Britos sent off in his debut.
Stoke, which welcomed back Bojan for his first competitive appearance since January, and West Brom required penalties to see off Luton Town and Port Vale following 1-1 and 0-0 draws, respectively, while Villa and Palace were taken to extra time on home soil by Notts County and Shrewsbury Town.