Diego Simeone backed Joao Felix despite substituting the attacker again in Atletico Madrid's 3-0 win over Real Mallorca in La Liga on Friday.
Joao Felix was replaced early in the second half at the Wanda Metropolitano, where Alvaro Morata scored a brace before Koke's sealer.
A reported €126 million (£113m/$142m) signing from Benfica last year, the Portugal international has been substituted in 17 of his 21 La Liga starts.
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But Atletico coach Simeone backed the 20-year-old and said he had full confidence in the attacker.