The initiative was set up to boost football-related charities, with players who join the scheme committing 1% of their wages to the campaign.
"It just seems right that our national sport gives something back to society," Daniels is quoted by Sky Sports News as saying.
"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."
Meanwhile, Mawson said: "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."
The Common Goal fund is run by the Berlin-based organisation streetfootballworld, which invests in more than 120 football-based charities in 80 countries.