OAKLAND, Calif. -- Athletics left-hander Brett Anderson could miss up to six weeks after he was diagnosed with a stress fracture in his right foot. Oaklands opening-day starter said he felt pain in his foot while running in the outfield Monday. Anderson, who came back from Tommy John surgery last summer after missing 14 months, has been on the disabled list since May 1 with a sprained right ankle. This is a separate injury. "Its pretty frustrating, disappointing and all the other similar adjectives," Anderson said. "I was two days away from making another rehab start and now Im in a walking boot with a fracture in my foot." Anderson underwent CT and bone scans during Thursdays off day, the team said. Anderson, who is 1-4 with a 6.21 ERA in six outings and five starts, is scheduled to be re-examined in four weeks. Thats likely when he will be done in the walking boot, though Anderson plans to attempt to throw in the meantime. Manager Bob Melvin had said Wednesday that Anderson was still experiencing soreness in his sprained right ankle, including after pitcher fielding practice Tuesday, and would be shut down indefinitely. "Its very unfortunate," Melvin said. "For a guy who worked as hard as he did to come back last year to be our No. 1 guy, you feel bad for him and you feel bad for the team." Anderson also pitched in relief during a 19-inning marathon on April 29, a game he was originally slated to start before being scratched. This is a discouraging development for Anderson and the reigning AL West champion As as they endure a tough stretch. They had lost eight of 10 entering Friday nights opener of a weekend series at home against the Kansas City Royals. Anderson had hoped his intense training regimen during the off-season and throughout his recovery from the reconstructive elbow surgery would keep him healthy this year as he started anew. "Id pitched in San Antonio and felt good after that. I was running Monday in the outfield and all of a sudden my foot started hurting. I got it checked out and this is the result," Anderson said. "Im still processing it. I should take up a hobby, maybe play darts or something." Also Friday, the As brought up left-hander Hideki Okajima from Triple-A Sacramento and designated struggling right-hander Chris Resop for assignment. The 37-year-old Okajima was 0-1 with a 2.16 ERA in 14 games with the River Cats. He last appeared in the major leagues with the Boston Red Sox in 2011. "Im very excited about pitching here," Okajima said. "It feels good coming back from Japan. I want to be able to pitch like I did my first year in Boston. I was hoping to get back to the majors and the As gave me the opportunity. I polished up some of my pitches in Sacramento, like the change and I worked on my cutter too. There was a lot of travelling to and from Sacramento." Authentic Soccer Spain Jerseys . 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Skipper Johnathan Thurston has warned his North Queensland teammates they face a humiliating end to their NRL premiership defence if they dont find form fast.The Cowboys slumped to their third successive defeat to Sydney Roosters on Sunday, their worst losing streak since the opening three rounds last year.The premiers sit on 28 points with three rounds to play, but their playoffs spot is yet to be confirmed given other results from round 23.And if Canberra beat Melbourne on Monday night in the nations capital, the Cowboys will sit two wins adrift of fourth place with three regular season games remaining.The Cowboys face a challenging road to the finals, which they will start by hosting the unpredictable Warriors before travelling to Belmore Sports Ground to face Canterbury the week after.In the final round theyll return to Townsville to meet Jarryd Haynes Gold Coast.It wasnt that long ago the Cowboys were considered top four certaintiies.dddddddddddd But according to superstar Thurston they are struggling simply to make the finals after losing four of their last five games.Finals are the furthest thing from my mind, he said.It is about getting confidence back. 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