Reus has spearheaded the side's meteoric rise to fourth in the Bundesliga table, netting seven goals in his 12 Bundesliga matches this season.
His performances have led to speculation that Bayern Munich are interested in securing his signature, and Favre is in no doubt that his star asset can perform at the highest level.
"Reus is definitely one of the best players I've ever trained. He has incredible skills, but is only 22 years old. There are still many things he needs to learn."
Germany coach Joachim Low has also taken time to talk about Reus, telling Express of the struggle he went through before earning his first cap.
"Marco has suffered greatly; despite being called up several times, he could not join the national team. He was very desperate.
"But he has overcome this hurdle and has played in two games. He will play [in friendlies against Ukraine and the Netherlands]."
Borussia Monchengladbach will host Werder Bremen in their first game after the international break.
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