[citation needed] In June 2009, in the lead-up to Adelaide's clash with North Melbourne, Douglas had a scare when he began displaying symptoms consistent with the swine influenza pandemic, and was quarantined, along with teammate and housemate Tony Armstrong.

[4] He signed a new three-year contract with Adelaide in June 2012,[5] and played his 100th AFL match shortly after, in round 12 against St Kilda.

[6] Douglas had one of his best years at the club in 2013, finishing runner-up in the Malcolm Blight Medal and being named in the preliminary All-Australian squad.

[4] Douglas suffered a potentially serious groin injury in a trial game in the 2014 pre-season, but he surprisingly returned just three weeks later, wearing a cricket box in a match against Port Adelaide and collecting 29 disposals.

[4] In June he signed a new three-year deal with Adelaide, joining teammate Rory Sloane in committing to the club until the end of 2018, and declaring himself as "a Crow for life".