Official Champions League sponsor Heineken has been allowing fans to interact with ex-footballers throughout this season's competition on Twitter with the #ShareTheSofa campaign.
To be in with a chance of winning the signed ball, all you have to do is submit Morientes or Garcia a question on Twitter, making sure you tag @SportsMole and @Heineken and include the #ShareTheSofa hashtag.
Our favourite question will be answered from Ibiza and also win the ball - simple!
If you don't have Twitter but still want to enter, send us your question via email to email@example.com.
Morientes, who will be cheering on Real on Saturday, won the Champions League three times with Los Blancos and was also the competition's top scorer in Monaco's run to the final in 2004.
Garcia, meanwhile, will be rooting for Atletico and was a Champions League winner with Liverpool in 2005.