Henderson has been impressive for the Bees since signing over the summer and the former Liverpool captain believes that form justifies his selection.
"I have shown what I can do for England over the years," he said. "I am still playing at a high level. Outside, people can think what they want. The most important people are the manager, the coaching staff and the players and what they think.
"Ask them what they think, if I am a cheerleader when I am here. I don’t think one of the best managers in Europe would be choosing me just to do that.
"If I have to speak to younger players, that should be a given, really. It is natural that the older you get, the more experienced you are, of course you want to pass on those experiences to younger players coming into camp."