Federer first became world number one in February 2004, but has not topped the rankings since October 2012 and slipped to a low of 17th in January 2017.
Clarey cannot see any player repeating those feats but says Federer has set a template that other players on the circuit can now follow.
"He didn't need to return to No 1 to show who he is in tennis", Nadal said."What he's achieved is very hard and you can only congratulate him. All the best for the season, keep it up and I'm sure I'll see you around soon", he said.
"I think for me Roger's not playing better than he was playing a couple of years ago, but right now he has found a great form", Pliskova said. Being No 1, No 3, No 5 doesn't make much difference. "In between it was a battle, it was nerve-wracking, but I was able to manage my nerves and the expectations".
"I have a great group of friends around me, in particularly my wife and parents are incredible so I always know I'll be fine once I retire and when I'm home".
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"I think that everything is possible".
"But the things he's passed along are very instructive and the great thing is that there is a whole new wave of tennis players coming in and watching him do this and going "hmmm, maybe that's a template to be followed".
Simona Halep added: "We were talking today, me with my team about him". On that occasion he stayed there for 237 weeks.
But at the age of 36, and the oldest person to become world No. 1 in the sport, the reality is that the 20-time grand slam champion is closer to the end of his career than the beginning.