Robinson appeared in just seven games for the Jacksonville Jaguars last season after signing a five-year deal with the team. Robinson dealt with concussions and was released by the Jaguars this offseason. He caught just 24 passes for 252 yards last season for the Jaguars after having a career year with the Dallas Cowboys in 2011. That season Robinson caught 54 passes for 858 yards and 11 touchdowns.
Robinson will have to prove his concussion issues are behind him if the 49ers are going to sign him. They took a look at concussion-plagued receiver Austin Collie this offseason too but he also remains a free agent.