Manchester United midfielder Mata wants players to join him in donating at least 1% of their wages to support football-related charities.
USA duo Alex Morgan and Megan Rapinoe became the first female players to commit last month.
Daniels said: "It just seems right that our national sport gives something back to society. If my pledge can help spread the idea of Common Goal, especially among the younger players, then it will be one of the proudest achievements of my career."
Mawson added: "It was only a few years ago that I was playing non-league and helping out my dad at weekends with his market stall.
"Common Goal allows me to focus on my career while forming part of something that can really help transform lives of those less fortunate."