The Real Madrid midfielder will take a 1.2% holding and will focus mainly on community engagement and social projects. Warwickshire will remain the majority stakeholder with 50.4% shares, and Knighthead Capital Management will hold 48.4%.
"I love Birmingham. I'm very grateful for what the whole city of Birmingham has done for me," said the 22-year-old.
"I love cricket as well so when I got the opportunity to get involved, I didn't really think twice about it, so I'm so happy to be on board.
"I got the best upbringing into football, into life through Birmingham City. I feel like I owe the city something.
"I was fortunate growing up, I had the option of playing cricket and playing football, but some kids don’t have that opportunity.
"It’s important that if I can get involved in something like this to shine a light on an opportunity for kids, then even better."
The sixth season of the tournament, which uses a 100-ball format, runs from July 21 to August 16.