The biggest concern surrounding the San Francisco 49ers' reunion with Robert Saleh is the possibility of him becoming the team's third consecutive one-and-done defensive coordinator.

Saleh, who was fired in October as the New York Jets head coach five games into his fourth season, generated interest on the head-coaching front and was seen as one of the frontrunners for the Jacksonville Jaguars job. He also interviewed with the Las Vegas Raiders and Dallas Cowboys.

There’s an interesting wrinkle to the San Francisco 49ers’ re-acquisition of defensive coordinator Robert Saleh. While they’re gaining an experienced defensive coordinator with a strong track record, they may also gain another opportunity to secure a pair of third-round draft picks if he’s hired to be another team’s head coach.

Later on Thursday, then-Tampa Bay Buccaneers offensive coordinator Liam Coen had a change of heart, the Jacksonville Jaguars quickly moved to hire him as head coach and Saleh, who told Kyle Shanahan and John Lynch that he’d return to the 49ers if he didn’t get a head-coaching job, stayed true to his promise.

Robert Saleh is heading back to San Francisco. Saleh and the San Francisco 49ers have agreed to a contract for him to return as the team's

Could the San Francisco 49ers bolster their defense around new coordinator Robert Saleh thanks to his New York Jets ties?