Former Stoke defender Andy Wilkinson has been forced to retire after failing to recover from a concussion injury suffered over a year ago. Wilkinson, 31, suffered a blow to the head after he was struck by the ball during Stokes FA Cup tie against Blackburn on February 14, 2015.The injury caused Wilkinson to suffer brain damage which affected the defenders vision and made him feel sick, particularly after training sessions. It was just volleyed straight in my temple and it shook me, Wilkinson told Sky Sports News HQ.I sprinted back and completely lost my right peripheral vision. Id just got back in the team so I just played on and didnt let anyone know. I played most of the game without being able to see on my right side.As time went on I developed more things - vertigo, nausea, balance problems. Then I had problems mentally, anger and feeling a bit depressed. Wilkinson has made 160 league appearances for Stoke Over a year on from the injury there are still a lot of things going on with my brain, my vision, my neck - all sorts of different symptoms, he added.Even if tomorrow I woke up fine and the specialists did say it was fine to play, the risk is far too high.Stoke originally planned to release the defender at the end of the 2014/15 campaign but instead offered him a new six-month contract, which ran out in January.Wilkinson travelled to the USA three times in order to receive specialist treatment from concussion experts in the hope of reviving his career. Wilkinson has not played for Stoke since last February However, those experts have now warned Wilkinson about the high risks of playing, effectively forcing to defender to announce his retirement. They say that my depth perception, where I think I am in relation to objects, is different than it actually is. Ive got the retrain my ocular motor system to get back to normal.The FA issued new guidelines in December that suggest a suitable timeframe for players to return to football after suffering a concussion but Wilkinson believes the English game can learn a lot from America.Ive seen the technology over there which they have going into the sports, he said. Tony Pulis has paid tribute to his former defender The baseline test that players can do every pre-season, where you cant fake the tests. If a piece of technology is put on you and you cant make the image out, it proves you shouldnt be in the game any longer.Wilkinsons former manager, Tony Pulis, has paid tribute to defender following his announcement.Wilkinson reflects exactly what that place was about - honest, hardworking person who gave just everything and I mean everything, he said.In training, in games, whatever you asked him to do. Any functions around the town, he never ever moaned or groaned and he always did everything to the best of his ability.Wilkinson, who has number of coaching badges, intends to remain in football following his retirement. Also See: Stoke video Stoke fixtures Stoke stats Get a £10 free bet! Air Force 1 Store . Vancouver Whitecaps and Toronto FC failed to make the postseason while Montreal Impact fell at the first hurdle losing heavily to Houston Dynamo in the Eastern Conference Knockout Round. Air Force 1 On Sale .Y. - General manager Billy King says the Brooklyn Nets are looking to add a big man and confirmed the team worked out centre Jason Collins, who would become the first openly gay active NBA player if signed. https://www.cheapairforce1outlet.com/ . PETERSBURG, Fla. Air Force 1 Cheap . Gerald Green and Miles Plumlee? Green had bounced around the NBA when he wasnt playing overseas. The Pacers gave up on Plumlee after just one season. Now Green and Plumlee are key cogs in the Suns surprising breakout season. Air Force 1 Outlet . "Four now," Carl Gunnarsson told the Leaf Report proudly following a 5-2 victory over New York on Tuesday night, the clubs fifth straight at home. Some of the sports stories The Associated Press is covering Friday. A full Sports Digest will be sent by about 3 p.m. All times EDT:- CHASKA, Minn. -- The United States tries to avoid its longest losing streak when the Ryder Cup begins at Hazeltine against a European team with six rookies. The U.S. has lost eight of the last Ryder Cups.- Wild-card races: AL: Orioles (at Yankees); Blue Jays (at Red Sox); Tigers (at Braves); Mariners (vs. Athletics). NL: Mets (at Phillies); Cardinals (vs. Pirates); Giants (vs. Dodgers).- SAN DIEGO -- Dick Enbergs broadcasting career has spanned five decades and included pretty much every big event there was. Now 81, he will retire after calling his final game for the San Diego Padres on Sunday in Arizona.- SEATTLE -- In Friday nights lone game involving the Top 25, No. 7 Stanford plays, with the winner immediately becoming the favorite in the Pac-12 North.- Stories on three key college football games Saturday: No. 3 Louisville at No. 5 Clemson; No. 8 Wisconsin at No. 4 Michigan; and No. 11 Tennessee at No. 25 Georgia.- COLUMBIA, S.C. -- The Southern Conference will keep four league championships in North Carolina despite the NCAA and the ACC withdrawing championships because of the state law restricting rights of LGBT people.- NASHVILLE, Tenn. -- Two men who helped integrate college basketball are back at Vanderbilt to disscuss their uneasy journey at a school with a sometimes painful history.dddddddddddd- CINCINNATI -- The defense got better with linebacker Vontaze Burfict back. Now the Bengals (2-2) need to fix their problems on offense, which start with their inability to get much when theyre close to the goal line.- DAVIE, Fla. -- Miami Dolphins coach Adam Gase shook up his lineup for Thursdays game at Cincinnati and still lost. So now what?- DOVER, Del. -- Jimmie Johnson knows how quickly a Chase spot can slip away. He lost his at Dover last year and hopes to avoid a repeat at the track this weekend.- NHL conference previews: The Capitals, Penguins, Lightning and Panthers look to be the class of the East. In the West, a slew of teams -- notably the Sharks -- have a shot at making the Stanley Cup finals.- TORONTO -- The World Cup of Hockey will be return, without a doubt, after a 12-year break. It is much less certain whether NHL players will be participating in the 2018 Olympics.- SACRAMENTO, Calif. -- After years of searching for a new home, the Sacramento Kings are set to open a new venue that raises the bar of what an arena can be.- Game 2 of two WNBA conference finals: Phoenix at Minnesota (8 p.m.) and Chicago at Los Angeles (10 p.m.). ' ' '