"We can all make a difference by donating blood. Each donation can benefit up to three people in emergency situations and for long-term medical treatments," Ronaldo said.
"That's why I am enthusiastic to be partnering with Abbott to bring awareness to the importance of blood donation and to encourage people around the world to become lifelong blood donors and help save lives."
Ronaldo has been a very key advocate for giving blood and is proud to have been a regular donor for more than six years.
The 30-year-old first gave blood in 2011 when the son of his Portugal team-mate Carlos Martins was sick and in need of a donation.
Ronaldo told Spanish radio station Cadena Cope, "We, the players, showed great unity to help him and his son because we knew it was a very complicated situation. If I had to do it again I would."
He also explained to Diretta News back in 2012 that donating blood is the reason why he does not join many other footballers in getting tattoos.
"I don't have tattoos because I donate blood very often," he said.