Warburton has won all five of the matches he has taken charge of since replacing Uwe Rosler in the Bees hotseat.
"We have a few loans that are up," he said. "We have two or three lined up, maybe four.
"Any players that come in have to add value on and off the pitch. We have a good harmony in the dressing room, a great spirit, and that can't be spoilt."