Pic: David Beckham pays tribute to his former Real Madrid teammate Zinedine Zidane on his birthday

What do you say to God on his birthday?

One of the eternal debates in football always involves this question, 'who's the greatest player of all time?'.

Messi, Maradona, Pele and Bendtner have all been put forward but you can also make a strong case for Zinedine Zidane to be at the top.

There aren't enough superlatives to describe the genius that Marco Materazzi's best friend possessed on the football pitch.

David Beckham tried his best with these kind words on Instagram though.

Happy birthday my friend... To a man that would never like to be called a genius but truly is in so many ways... Professional , hard working , beyond talented and one of the nicest human beings you could meet on and off the football field... THE BEST @zidane

A photo posted by David Beckham (@davidbeckham) on Jun 23, 2015 at 4:22am PDT

As it's Zidane's birthday, we're going to take a look at the finest achievement in his career, playing at Dalymount Park for Bordeaux against Bohemians.