Mel was left disappointed with their performance.
Asked about his hopes of extending his stay at the Hawthorns after arriving on an 18-month deal, he said: "I really don't know. That's not a decision for me to take, I'm not sure.
"What we need to try to do is try to change the image that we are giving of the team against Stoke City.
"I am very disappointed with the first half. I don't understand what happened in that first half. We weren't able to equal Sunderland's intensity."