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."Mike Muscala Jersey . 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"They are a very good defensive team," Penguins forward Brandon Sutter said.David Weir made history on Sunday when he broke three minutes in a wheelchair race in the Westminster Mile in London.The Briton clocked two minutes and 57 seconds - beating his previous world best by six seconds - to secure his latest achievement after six victories at the London Marathon.Ive always said I could do it, said Weir, who finished ahead of South African rival Ernst van Dyk and also won four gold medals at London 2012.I knew it was possible and training has gone really well. I knew I had to get off to a quick start and that Ernst would chase hard. I knew from last year that my start let me down.I was more relaxed down Birdcage Walk, but I was still pushing at 22mph and thats not bad.I wanted to prove a point that I was still up thhere with the best in the world.ddddddddddddVictory secured Weirs fourth consecutive Westminster Mile title, and comes after he finished third in last months London Marathon.Roger Bannister, who in 1954 was the first man to run a mile in under four minutes, sent Weir all my congratulations for his huge achievement.Nick Goolab won the British Athletics mens road mile title, while Sarah McDonald won the womens senior title.Britains athletes will head to Italy next month for the IPC Athletics European Championships in Grosseto (June 10-16).Also See:2016 IPC European Athletics ChampionshipsWestminster Mile websiteBerlin glory for Weir ' ' '