why are 49ers sitting Christian mcaffrey focuses on the risk of season-ending injury Kyle Shanahan head coach of the San Francisco 49ers stated on Tuesday that Christian mcaffrey has Achilles tendinitis which the club has to be very careful about the 49ers took care with the All Pro running back keeping him out of Monday's season opening Victory against the Jets after Shanahan suggested that he was engaged in medical conversations about the dangers of mcaffrey participating when you hear that type of stuff and it's not a playoff game it's week one and especially when you're dealing with a lower extremities like that it was a tough decision Mr Shanahan said but hearing all the words in the long run it made it easy two words that in the end certainly made sitting as the 2023 offensive player of the year a simple decision torn Achilles that is according to Dr Kenneth Yung a foot and ankle surgeon and Los Angeles Rams consultant Yung of course is not privy to McCaffrey's medical records