He went on to discuss the prospect of facing Djokovic for a ticket to the final.
The world number one took another giant stride towards matching Bjorn Borg's five titles at the All England Club with an emphatic 6-4 6-0 6-2 quarter-final triumph. He is the first player to win 100 matches at one Grand Slam tournament.
The top seed will play Spaniard Roberto Bautista Agut who beat Argentina's Guido Pella in four sets. "His ability to stay in the point even when it seems like he's on the back foot", Djokovic said of Bautista Agut.
"I think it's going to be tough", Federer said.
This is their fourth matchup at Wimbledon - and first that won't come in the final.
Against Querrey, Nadal was broken when serving for the first set at 5-4. On surfaces other than clay, Nadal holds a 4-3 edge at Grand Slams.
Djokovic is seeking his fifth trophy, and second straight, at the All England Club, while Bautista Agut is making his Grand Slam semifinal debut.
"No, no", a smiling Nadal said when asked if he was expecting new things from Federer this time around. "I had Federer originally to start the tournament but now the grass is slower so now I pick Rafa".
Bautista Agut will not be daunted either, having twice beaten the Serb this year.
The odds don't look great for Bautista Agut winning it all. "Well, it feels better to be here in London".
At the age of 37 years and 336 days, Federer became the second-oldest man to reach the Wimbledon semifinals in the Open Era, after Ken Rosewall (39 years, 246 days) in 1974.
"Excited to be back on this court against him after 11 years", said Nadal, who won 9-7 in the fifth set against Federer in that legendary 2008 final, one that lasted nearly seven hours in part because of rain delays. Rafa and Federer share one of the greatest rivalries in tennis meaning that this should be an outstanding match. "I know people always hype it up in a big way", said Federer. Federer has won two of their three previous encounters in this spot.
Roger Federer became the first man to win 100 matches at Wimbledon. Nadal has won on 24 occasions while Federer has won 15 times. Yeah, a hundred wins here at Wimbledon. Federer lost the opening set but was dominant in the final 3 sets which he won.
It was enough for the 29-year-old to pocket the first set.
SK: Federer in four sets. His game looks in flawless nick and it will take something extra-special from the No 23 seed to stop the Serb from reaching the final for the sixth time.
Spain's Rafael Nadal sprints to make a return against U.S. player Sam Querrey during their men's singles quarter-final match on day nine of the 2019 Wimbledon Championships at The All England Lawn Tennis Club in Wimbledon, southwest London. But he converted his fourth break point in the next game, then saved three break points at 6-5 before finally clinching the set.