NJ.com's Jordan Raanan reports Jeremy Maclin fears he tore his right ACL during Saturday's training camp practice. Maclin knows the feeling of an ACL tear because he suffered one during his college career. He will undergo an MRI shortly. Following the injury, Maclin immediately fell to the ground "writhing in pain." Riley Cooper is Maclin's direct backup at X receiver, although we wouldn't expect much fantasy production from the No. 2 wideout in Chip Kelly's run-dominated offense.