Courtois admits Conte initially started the squad off playing in a 4-2-4 in pre-season, but quickly adapted to the team's needs as he got to know his squad better.
Speaking to La Tribune after Belgium's 8-1 win over Estonia on Sunday, Courtois said: "Conte is the one that works most tactically. Then there is [Diego] Simeone, then Mourinho and finally [Marc] Wilmots.
"Then Conte said, 'we will change'. At Hull, things were rather mixed at first and then against Leicester, Manchester United, Southampton and especially against Everton, we really saw the quality of the team."
"In pre-season, he [Conte] tried the 4-2-4 but he saw that it was not working very well, so he went to 4-3-3 because he knew that Willian and [Eden] Hazard were strong in one against ones," Courtois added.
"But he found that too many avoidable goals were scored and decided to play safely by moving to three at the back."