The Potters sent him packing after a 10-day trial in December.
And now he could come back to haunt Stoke boss Tony Pulis at the Britannia.
Sporting Kansas City striker Kamara, 28, said: "I had several training sessions with them and played in some practice matches as well. I am known as someone who is good in the air so I was hoping it would be a good club for me to join. They didn't tell me why they didn't want me and I didn't ask. Everybody sees different things.
"Some people might not like my girlfriend - but I think she's the most wonderful woman in the world."