Considered a highly promising prospect in his youth, Courtois subsequently established himself as one of the best players in the world in his position.  Due to his wide range of skills, he has been described as a "complete goalkeeper", with few weaknesses.  A consistent keeper, he possesses an excellent positional sense, good mentality, composure, strength of character, and an ability to communicate well with his defenders; he also excels in one on one situations, due to his ability to time his runs effectively when rushing out of goal to face opponents, and has even functioned as a sweeper-keeper on occasion.  An excellent shot-stopper between the posts, he has also distinguished himself for his agility and quick reflexes, in spite of his size and imposing physique.  Due to his height and reach, he excels in the air, and is also known for his command of his area, as well as his excellent technique, anticipation, handling, and confidence when coming off his line to claim crosses.