"To go past so many players with such speed and balance is one thing, but to have the composure and awareness to pick a pass at the crucial moment showed great skill and maturity.
"There can be no disputing Walcott's ability."
He also described a potential all-England final as "fantastic".
Capello said: "I'm very pleased that England has three of the four semi-finalists for the Champions League.
"It is a tremendous situation for the supporters of those clubs and it shows the strength of the Premier League.
"For three sides with such contrasting styles, it is positive that English players are proving their flexibility and tactical awareness.
"It will be very interesting to watch the semi-finals and see who can reach Moscow.
"There is a real chance that it could be an all-English final, which would be fantastic for the England players involved, and that could only be a positive for the England team."