Young Jr. was designated for assignment last week in order to make room for the activation of right-hander Chris Volstad. The outfielder posted a .316/.377/.448 slash line in 196 plate appearances last year but has hit just .242/.290/.352 with one homer in 180 PAs this year. The 28-year-old has experience at all three outfield positions as well as 49 games at second base.
McHugh has 11 big league games under his belt but has spent the 2013 season with the Mets' Triple-A affiliate. In nine starts for Las Vegas, McHugh has a 2.87 ERA with 6.9 K/9 and 2.2 BB/9. Despite his success there, he'll report to the Rockies' Double-A affiliate, according to Troy Renck of the Denver Post (on Twitter).
Cowgill, 27, has a .173/.189/.327 slash line in 53 plate appearances this year. In parts of three seasons at the Triple-A the outfielder has hit .307/.381/.476.