A team player sees the bigger picture and will do what is right for the team.
A team player will put themselves on the line when required. When they see a need they will fill it.
A team player provides value by any means necessary. If that means being put in a pressure situation or cheering from the sideline.
A team player is always supportive of their team members.
A team player is always ready. They take care of themselves first so they can do their job to the fullest.