England captain Rio Ferdinand signed 101 special edition cards for the Topps trading card game Match Attax.
The cards were then hidden in card packs worldwide, 100 of them were Special Silver Foiled cards. When found, collectors can register the them at www.toppsfootball.co.uk to get an invite to a Match Attax event where they can meet the Manchester United defender.
There is only one golden card up for grabs and whoever finds it will get the chance to go head-to-head with Rio at a game of Match Attax.
Match Attax is the only official Premier League football card trading game and has an estimated 1.5m fans, buying 144,000 cards each day.