The Frenchman reached a career-high ranking of sixth in the world in 2016 after reaching the semi-finals of the US Open, when he was beaten by Novak Djokovic.
Monfils’ run at Flushing Meadows was the second of two Grand Slam semi-final appearances in his career, having lost to Roger Federer in the last four of the 2008 French Open.
“While I came close, I never did win a Grand Slam during my career,” continued Monfils.
“I won’t pretend that I expect to do so during the next year.
“What I do have is the feeling that I have been lucky: insanely, stupidly lucky. I’ve had the chance to play during a golden age of tennis, alongside some of the greatest names in the history of our sport: Federer, [Rafael] Nadal, Djokovic, [Andy] Murray.”
Monfils appeared at four Olympic Games, reaching the quarter-finals in Beijing in 2008 and Rio de Janeiro in 2016.