On 28 December 2021, Watanabe signed a three and a half year contract with Kortrijk in Belgium.[4] On 1 July 2023, Watanabe moved to fellow Pro League club KAA Gent on a permanent deal for a fee of €3,500,000.[5]
On 23 July 2025, Watanabe joined Dutch side Feyenoord on a four year contract.[6] On 12 August, he scored his first two goals for the club in a 5–2 defeat to Fenerbahçe in the third qualifying round of the UEFA Champions League.[7]
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