A short week was not kind to the San Francisco 49ers, and the team will be without key offensive pieces, including quarterback Brock Purdy, against the Los Angeles Rams on "Thursday Night Football." Wide receivers Ricky Pearsall and Jauan Jennings will also be unavailable for the 49ers Thursday night. Purdy missed Weeks 2 and 3 after suffering a toe injury in the season opener but returned in Week 4 against the Jacksonville Jaguars. The 49ers will turn to receivers Kendrick Bourne and Demarcus Robinson, the latter of whom made his season debut last week after serving a suspension. This is already a pivotal game in the NFC West race, with both teams entering at 3-1 in the first of two matchups this season.