The former England captain is a free agent after he left Aston Villa earlier this summer.
He told the Daily Mail: "The fans were brilliant. They came to the training ground every day in the build-up to the game against Birmingham.
"Their message, "We would rather be relegated than lose to these!" I've never felt so much pressure in a game but we won 2-0 and Villa Park was buzzing.
"We were filling the stadium. Someone threw a stat at me, "John, this is the biggest home crowd you have ever played in front of". It was.
"So I'll decide in a couple of weeks. I've got three or four offers on the table to carry on playing — domestically or abroad — the chance to work in TV, or I will go into management."