The pair won the FA Youth Cup with Chelsea in 2014.
Ssewankambo arrives from Molde and he told the Ostersunds Posten: “It’s great in England when you’re young. We won it together and we both played the match. It’s a good memory. We were quite close and had a good relationship.
“It was a good time for me. Very educational. Being there from 14-18, I could grow up there.
“I have many good memories there.”