Nothern Ireland won the friendly 2-0 with Bradley scoring both goals.
"We've got a really special young player who can only continue that way," said O'Neill.
"His attitude to the game is maybe his biggest attribute, he just loves to play.
"He trains that like that, he always trains at his maximum and I think at times the other younger players feed off that.
"Conor has demonstrated the ability and the versatility to play pretty much anywhere down the right side but the damage he did (against Andorra) is when he arrived in central areas.
"As you can see, when he gets in the box the timing of his runs and his finishing is great. I think he could probably play as an eight. We had discussed that.
"I think there's certain games where, if we played with a midfield three, he'd be suited to play as a right eight."