Martinelli, who was booked for the flashpoint, stated on Instagram that he didn't understand he was seriously injured in the heat of the moment and had messaged Bradley directly.
The incident drew criticism, with former Manchester United captain Roy Keane calling Martinelli a disgrace, though Arsenal manager Mikel Arteta defended his player.
Liverpool manager Arne Slot expressed concern for Bradley's injury, while the draw saw Arsenal extend their lead over Manchester City to six points.