It was a short stint in the nation's capital for United's latest Designated Player, who departs after playing just seven games.
The 20-year-old forward was originally signed as a young Designated Player in January of 2013. He appeared in seven matches (four starts) this season, scoring one goal.
In a Q&A on the team's official website, United GM Dave Kasper said: “We thought he would be further along at this point of the season in his adaptation and development."
He continued: "Casey Townsend has come into the picture recently with solid play, and Rafa lost playing time as a result. We did not see this changing. In the end, with a looming decision on a big transfer payment for a player on loan, we felt it would be wiser to look to invest funds toward players elsewhere.”