The Brazilian put pen to paper on a one-year contract with the MLS side, who had been a free agent since leaving AC Milan in 2011
The 27-year-old joined AC Milan in 2005, but only managed to make one Serie A appearance for the Rossoneri, and was farmed out on loan to several clubs.
His contract at San Siro expired in 2011, but he caught the eye on trial with the MLS side and secured a permanent move to the Red Bull Arena on a one-year deal.
"Digao has impressed our coaching staff during his trial in the past week and we want to continue evaluating him for the remainder of the season," the club's sporting director Erik Soler told reporters.
"He has earned a solid amount of experience for a number of European sides and we are glad to add him to our roster."