They've gone toe-to-toe on the field several times over the years and now, as Steven Gerrard prepares to play his final Liverpool game, Cristiano Ronaldo has delivered a special message to his old adversary.
As well as competing against the Reds' No.8 for both Manchester United and Real Madrid, Ronaldo has also faced him at international level for Portugal against England.
And the 30-year-old has today added his name to an ever-growing list of footballing luminaries eager to pay tribute to Gerrard as he prepares to leave Anfield after 17 years in the first team.
To watch Ronaldo's personal message to Gerrard, click play on our exclusive YouTube clip below.
LFCTV's brand new documentary 'Gerrard: My Liverpool' airs for the first time on Saturday May 23 at 7.30pm BST. Click here for details.
Visit our special tribute to Steven Gerrard here liverpoolfc.com/gerrard.