Kato made his debut for Verdy against Thespakusatsu Gunma on 13 March 2022, coming on as a substitute in the 59th minute for his teammate Kohei Yamakoshi.[3] He would score his first goal for the club in a 1-0 victory over Oita Trinita, on the 3rd of April 2022, scoring in the 42nd minute.[4]
Kato made 40 appearances for Verdy in the 2023 J2 League season, helping them gain promotion to the top-flight through the play-offs.
In December 2023, it was announced that Kato would be moving to J1 League club Yokohama F. Marinos for the 2024 season.[5]
^"加藤蓮選手(明治大学)加入内定のお知らせ" [Announcement of unofficial decision to join Ren Kato (Meiji University)]. verdy.co.jp (in Japanese). 17 September 2021. Retrieved 13 March 2022.
^"伝統の明治大出身サイドバックがまた一人…東京V内定DF加藤蓮「プレッシャーではなく、それは誇り」" [There is another full back from the traditional Meiji University ... Tokyo V informal defender Ren Kato "It's not pressure, it's pride"]. web.gekisaka.jp (in Japanese). 3 December 2021. Retrieved 13 March 2022.