Giles told BBC Sport: "He had a fantastic season. We expected big interest in him, we have had big interest in him. He has his ideas about where he wants to take his career. He is well within his rights to do that.
"It is not impossible he is still a Brentford player next season if we agree he is going to stay. Any club will tell you that," he added. "If it's not right deal, why would we do it? He is certainly one of our best players, if not our best player, and we need our best players. There's no harm in keeping your best players."