Allen, the team's leading receiver with 48 catches for 548 yards, was hurt during the Jaguars' 31-17 loss to Dallas on Sunday at Wembley Stadium in London, but coach Gus Bradley said Tuesday that the team was unsure when during the game Robinson suffered the injury.
Robinson never left the game and caught five passes for 60 yards.
The 6-foot-3, 210-pound Robinson was the second of the Jaguars' two second-round draft picks in May. He came to the NFL out of Penn State, where he caught 177 passes for 2,474 yards and 17 touchdowns in his career. He missed much of the offseason OTAs and minicamp with a hamstring injury, which he re-injured on July 31. He missed the entire month of August and returned to practice on Sept. 1, six days before the season opener. Robinson caught one pass for zero yards in that game, but had at least four catches in every game since then.