MLS's summer signing period just started, and Metro has another trialist in fold. He is Colombian left back Mauricio Casierra, most recently with Once Caldas, reports BigAppleSoccer.

Casierra, 27, is back with the club with which he debuted back in 2002 (back then, he teammate was none other than Sergio Galvan Rey). He has also played for Estudiantes and Belgarno in Argentina, as well as Millonarios in his home country.

Casierra has been capped twice for Colombia, back in 2006.