Luetge signed a minor-league contract with Oakland on Monday, which includes an invitation to spring training.
Luetge hasn't appeared in the major leagues since the 2015 season, so he's likely a longshot to crack the 25-man roster. He tossed 43 innings for Triple-A Reno in 2019, posting a 3.14 ERA and 1.33 WHIP with 46 punchouts.