While there was a lot of talk last year about how badly the Colorado Rapids needed a #10 or a #9, there was one other position that was consistently exposed - left back. And with all the news coming out today about the CCL seeding, the cap space, and the new head coach, it would have been easy for this rumor to fly under the radar. But thanks to @CapTied96, we found this little nugget of information:

Castillo has spent his entire career in Liga MX and most recently joined Monterrey in 2015. The 31-year-old left fullback is known for his explosive speed and is one of two players to ever earn a senior cap for both the United States and Mexico (he was born in the United States but is of Mexican descent). He made his US debut in 2009, and had four appearances for Mexico and three for their U-23 team in the years prior. There was some discontent expressed by fans of both countries when he decided to play for the other side.

US Soccer created a short about Castillo in 2014, when he was playing for Tijuana:

I had a tough time finding decent stats, but looks like he has 9 goals over the course of his club career.

I reached out to the Rapids about this rumor and they had no comment.