The former Liverpool defender joins a star-studded cast for the event, which is part of the four-day UEFA Champions Festival building up to the main event between Bayern Munich and Borussia Dortmund at Wembley.
The father and son superstar actors will step onto the pitch to help warm up the goalkeepers with a penalty shoot-out and then undertake the coin toss in front of the match official.
|Hero: Liverpool fans paid tribute to their long-serving defender during his final match on Sunday|
|Mission: Will and Jaden Smith are in London to promote forthcoming film After Earth|
|End of an era: Jamie Carragher called time on his Liverpool career last weekend against QPR|
Football greats such as Luis Figo, Gianfranco Zola, Michael Laudrup and Fabio Cannavaro are among those on show for the event near the Queen Elizabeth Olympic Park.
The five-a-side event will kick off at 12.30pm after Will Smith and his son Jaden, who are in town promoting forthcoming film After Earth, have signed autographs for their fans.
The four-day festival is free to attend and celebrates London hosting both the Champions League final and Women's Champions League final - at Stamford Bridge on Thursday May 23.
German giants Bayern Munich and Borussia Dortmund will contest the showpiece in front of 90,000 fans at Wembley on Saturday night after they saw off Barcelona and Real Madrid respectively in the semis.
Wembley last hosted the Champions League final in 2011 when Barcelona defeated Manchester United 3-1 to be crowned European champions for the fourth time.