Roma signed Smalling, 34, from Manchester United in the summer of 2019, initially on loan.
The English centre-back has had injury problems this season and has only played twelve competitive matches.
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The veteran is tied to Roma until the summer of 2025.
But now transfer journalist Nicol Schira reports that Smalling is set to leave Roma: "Chris Smalling could leave AS Roma during the summer transfer window. His contract expires in 2025, but he is not in (Daniele) De Rossi's plans for the next season."