Per Field Yates, the 49ers tried out just about every available fullback with Kyle Juszczyk expected to miss over a month.
Here are the names:
Aston was with the Broncos during the preseason before being cut. He is an undrafted rookie out of Pittsburgh that was known as an outstanding blocker coming out of college. I don’t think this is a good indicator of being a good receiver, but Aston did catch 45 passes and score eight touchdowns in three years. His preseason run-blocking grade from PFF was 47.