The pair played together at West Ham and Defoe said: "Anton Ferdinand is my mate and he said, 'You are going to miss', but I was confident.
"I was just delighted when it hit the back of the net, I was so happy.
"I gave him [Ferdinand] a look. They worked really hard as well and I suppose if it was us who had conceded a penalty in the last minute, we would be devastated.
"But overall it was a good game and we were delighted with the three points.
"We are delighted for the manager to have his first win."