Mychal Rivera dropped a pair of passes in Friday's preseason opener against the Vikings, CSN Bay Area reports.

Rivera dropped a pair of passes in Friday's preseason opener against the Vikings, CSN Bay Area reports.

Analysis:

Starting in place of David Ausberry (knee), Rivera dropped both of his targets. With the length of Ausberry's absence uncertain, Rivera may end up as the Week 1 starter. There's some chance Rivera could start even if Ausberry recovers in time, as the Raiders don't have a clear-cut top dog at tight end.