Oakland signed Marcell Ateman on Thursday to take Nelson's spot on the 53-man roster. Ateman was on the practice squad the first four weeks and played briefly last Sunday against Chicago before being waived to make room for the recently acquired Zay Jones.
Nelson signed a $1 million contract in free agency but struggled to stay healthy in his only season in Oakland. He hurt his knee early in the opener and sat out the next game. He returned in Week 3 and caught a TD pass against Minnesota but missed the past two weeks because of the knee.