Gallop: Harry made football cool
Kewell announced on Wednesday that he will retire from professional football at the conclusion of the current A-League season.
The decision brings to a close a stellar career that included 58 A internationals and 17 goals for the Socceroos.
Gallop said: "Harry was a genuine superstar for the Socceroos and his clubs in Europe and Australia.
“Harry made football cool for generations of Aussie kids.
“His goal against Croatia in 2006 delivered our best ever World Cup finish and his return to the A-League in 2011 was the spark that set off the huge increases in crowds and TV ratings.
"On behalf of the football community, I congratulate Harry on a marvellous career and wish him well with the next part of his journey."
Gallop said the FFA would find a suitable way for fans to "pay tribute" to the Aussie legend, including the farewell to the Socceroos at ANZ Stadium on 26 May.