The defender has worked his way back into the Saints first team under manager Ivan Juric after being frozen out by former boss Russell Martin.
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Bella-Kotchap, twice capped by Germany, has a deal with Saints to 2026.
He told DAZN: "English football has helped me a lot in my development, and I want to take further steps in the coming years.
"Whether that will be in England, I don't know. I'm open."
Bella-Kotchap spent last season on-loan with PSV Eindhoven after refusing to play in the Championship with Saints. With the club set to be relegated again, the defender is expected to be sold this summer.