Diame was a target for Arsenal and Tottenham last month.
Gold said: "This was a difficult window for us. We've had the concern of Diame leaving almost right the way through, so we are delighted that he is still here.
"We see him as an important and integral part of the squad. It's not been good having that hanging over us and now, with the uncertainty gone, we know who we have to see us through to the end of the season.