Jauan Jennings was in uniform and took the field for the 49ers’ practice Monday morning, six days before their season opener. Jennings had missed more than a month of practices in training camp and the preseason with a calf injury weeks after requesting a raise or a trade.

Jennings reported on time and took the field for the 49ers’ initial training camp practices but has been out with July 27 with a calf injury similar to the one that caused him to miss camp time a year ago, according to coach Kyle Shanahan. He hasn’t spoken to reporters during that time, and unlike teammate Brandon Aiyuk, who is rehabbing a torn ACL, has not been on the field with teammates, although he’s been attending meetings.

In the second year of a two-year, $15.39 million contract extension, Jennings reportedly as

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