On 5 October 2020, the last day of the 2020 summer transfer window, Pfeiffer joined Danish Superliga champions FC Midtjylland on a deal until June 2024.[3] The transfer fee paid to Würzburger Kickers was reported as €1.5 million.[2]
On 2 August 2022, Pfeiffer joined VfB Stuttgart on a four-year contract.[5] On 17 August 2023, Pfeiffer returned to Darmstadt 98 on a season-long loan.[6] On 27 August 2024, he was loaned to Karlsruher SC for the 2024–25 season.[7]
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