Long has been ruled out for Sunday's game against the Seahawks with a thigh injury, Jourdan Rodrigue of The Athletic reports.
Long was removed from the Rams' active/PUP list Aug. 26 after passing a physical, but he'll have to wait for at least one week before making his season debut. With Long out of the mix for the season opener, Brycen Hopkins and Davis Allen will be the Rams' available depth tight ends behind starter Tyler Higbee.