World number three Dominic Thiem said tennis players “must learn” from the ill-fated Adria Tour and described Nick Kyrgios' criticism of those who took part as “unnecessary”.

“We have to learn from the mistakes and be careful nowadays with this pandemic we are facing. That's what we have to take from the Adria Tour,” Thiem told reporters at an exhibition tournament in Berlin.

Kyrgios has been highly critical of anyone who played in the Adria Tour, which he branded a “boneheaded decision” to hold with such little regard for hygiene.