During the 2018 offseason, Sekera injured his Achilles tendon while training and was set to be out indefinitely. In the 2018–19 season, following a lengthy rehab, Sekera returned to play on a conditioning assignment with AHL affiliate the Bakersfield Condors, on February 5, 2019. After five games, Sekera returned to the Oilers and made his first appearance with Edmonton in over a year, playing a third-pairing defensive role against the Arizona Coyotes on February 19, 2019. Sekera played out the season with the Oilers to finish with 4 assists in 24 games.