San Francisco head coach Kyle Shanahan said that Robinson is facing a recovery timeline of 3-to-6 weeks after sustaining a high-ankle sprain in Sunday's 35-13 win over the Dolphins, Nick Wagoner of ESPN.com reports.
Shanahan noted that Robinson will most likely be placed on injured reserve, though the 49ers haven't finalized any decisions since the team can bring back only eight players from IR and already has a lengthy injury list two games into the season. Robinson had been expected to serve as a depth receiver for the 49ers, but injuries to Ricky Pearsall (knee), De'Zhaun Stribling (ankle) and Christian Kirk (calf) had opened up more playing time for the 32-year-old than anticipated through the first two weeks of the season. He produced a 5-84-1 line on six targets between wins over Rams and Dolphins to begin the campaign.