The Detroit Lions have agreed to a contract with veteran tight end Zach Ertz, a source confirmed to ESPN. His addition comes after Lions tight finish Brock Wright sustained a forearm damage in Detroit’s divisional spherical victory over the Tampa Bay Buccaneers. The Lions additionally will doubtless be without starting guard Jonah Jackson for the sport against the 49ers. Jackson underwent surgical procedure for a slight meniscus tear, a source told ESPN’s Jeremy Fowler on Monday. Jackson is anticipated to miss the NFC title recreation but could presumably be again for the Super Bowl if the Lions advance, the source …