Robert Turbin

The reasoning behind the Seattle Seahawks’ decision to bring in former Buffalo Bills running back Fred Jackson for a visit seemingly became clearer on Tuesday after head coach Pete Carroll revealed Robert Turbin suffered a serious ankle injury in the Hawks’ preseason matchup at San Diego on Saturday.

Speaking with reporters after Seattle’s practice in anticipation of their preseason finale Thursday, Carroll hinted that Turbin’s injury may keep him out of action for a while.

“Robert’s got a sprained ankle,” Carroll said. “It’s a significant ankle sprain. We have to see what that means. He feels pretty good about it, but it definitely showed up on the MRI and all that.”

The fourth-year pro carried five times for 19 yards against the Chargers, last touching the ball on a 6-yard loss from the San Diego 9-yard line following a 29-yard run from Christine Michael.

Carroll said that Turbin got “whacked” and “rolled up on,” and that there was timetable for Turbin’s return. Carroll also said that the injury wasn’t the only reason they decided to bring in Jackson for a visit after he was released by the Bills on Monday. But now it at least makes a lot more sense.