In the 2016–17 FA Cup, Millwall reached the Quarter-finals for the tenth time in their history, knocking out Premier League opposition in three consecutive rounds: Bournemouth in the third round, Watford in the fourth round, and reigning Premier League champions Leicester City in the fifth round. On 28 February 2017, Millwall beat Peterborough United 1–0 and increased their unbeaten run to 16 games in all competitions, and have gone nine games without conceding a goal for the first time since the 1925–26 season. Millwall made it to the League One play-off final at Wembley for the second successive year, after beating Scunthorpe United 3–2 in the semi-final. They were promoted back to the Championship following a 1–0 playoff final victory over Bradford City, thanks to an 85th-minute winner from Steve Morison, his 86th goal for the club. In Millwall's return to the Championship in the 2017–18 season the team went on a club record 17-game unbeaten run; their longest streak in the second tier, which surpassed a record of 15 set in 1971. During the undefeated run they won six away wins in a row, equalling a club record set in the 2008–09 season. In the 2018–19 FA Cup, Millwall once again reached the Quarter-finals for an 11th time, only losing to Premier League side Brighton on penalties. In the previous round they knocked out Premier League side Everton, to equal Southampton's FA Cup 'Giant-killings' record, having knocked out 25 top-flight teams when not in the top flight themselves.