Texans running back Arian Foster’s strained right calf will keep him off the practice field until training camp this summer.Foster was injured in an off-season practice on Tuesday. Tests revealed no further damage, but the strain will keep Foster on crutches for at least a couple of days. Coach Gary Kubiak says he expects his leading rusher to be fine, but that he won’t participate in the team’s practices over the next two weeks.Kubiak said that Foster, who ran for 1,424 yards last season, was injured simply taking a step on a play on Tuesday. He believes Foster will be healthy in time for the start of training camp, which is in late July.Briefly • Patriots: Tight end Rob Gronkowski, who has had four surgeries on his twice-broken left forearm, will have back surgery next month and is expected to miss at least the start of training camp, according to NFL Network. • Raiders: Cornerback D.J. Hayden was released from the hospital after having surgery to remove scar tissue from his abdomen. Hayden, the 12th overall pick of the 2013 draft, had a life-threatening injury at a practice last season at the University of Houston. • Cardinals: Sixth-round draft pick Ryan Swope, a receiver from Texas A&M, has missed practice time at Arizona OTAs during to lingering issues from concussions he suffered in college, teammate Larry Fitzgerald said on SiriusXM radio. • Buccaneers: Receiver Steve Smith, who earned a Pro Bowl berth with the Giants in 2009 before playing with the Eagles, Rams and then signing earlier this year with Tampa Bay, is retiring after six NFL seasons. • Redskins: Ten members of Congress recently sent team owner Daniel Snyder a letter urging him to change the name of his team, calling the word “a racial, derogatory slur.” Similar letters were sent to Commissioner Roger Goodell and the other 31 NFL owners. • Browns: Hall of Fame running back Jim Brown, 77, was named a “special adviser” by team owner Jimmy Haslam and will focus on community work, interacting with fans and helping mentor players. • Broncos: Veteran cornerback Quentin Jammer, the former Texas Longhorn who was the fifth overall pick of the 2002 NFL Draft, agreed to terms on a one-year contract with Denver after spending his first 11 seasons with the San Diego Chargers. • Steelers: Linebacker Sean Spence, who tore three ligaments in his left knee in last year’s preseason finale, said he expects to play sometime this season. Spence was a third-round draft pick in 2012. • Bills: Tight end Lee Smith will miss the rest of minicamps after hurting his lower right leg in the weight room.