The 21-year old Belgian, in his third season-long loan from Chelsea, has been an integral part of Diego Simeone's side this season which has seen Los Rojiblancos challenge Barcelona for top spot in La Liga.
In the wake of Atleti's 2-0 Copa del Rey victory over Valencia on Tuesday night, Garcia spoke highly of Courtois, saying he was just as important to the setup as the goalscoring stars such as Diego Cost and David Villa.
"Courtois brings a lot to the team and his self-belief helps us wins games," Garcia told Marca.
"It's not just our goalscorers who're important; he is too.
"He's young, but he's tremendously mature for his age. Keepers usually reach that level when they're slightly older.
"He also has room to improve and what's good is that he wants to work on becoming a better keeper."
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