Federer beat Wawrinka en route to winning the 2017 Australian Open, a result that rolled back the years with the Swiss facing old rival Rafael Nadal in the final.
Federer's return to the top of the game, having taken six months off before the tournament, has been well received by the tennis public and Wawrinka had some very kind words for his fellow countryman.
Speaking to Tennis World USA he said: "He [Federer] is incredible. He is the best player of all time. There are no limits for him. Winning a Major title after taking six months off is unbelievable, but I mean, we are speaking about Roger.
"Also before his injury, he was always in the semi-finals or final, last year he reached Wimbledon semi-final despite his knee. His level was always there."
On Friday Federer received a bye in the quarter-finals of the Indian Wells Masters as Nick Kyrgios pulled out with illness having beaten Novak Djokovic in the previous round.
Federer will now face the winner of the match between Jack Sock and Kei Nishikori.
He could hypothetically face Wawrinka in the final, with the world number three facing Pablo Carreno Busta in the semi-finals.
Read the original article on Eurosport: Wawrinka - Federer is the best of all time, there are no limits for him