An unnamed German athlete's A drug sample at the Sochi Winter Games is abnormal and a second sample will be tested later on Friday, the German Olympic Committee (DOSB) said.

The DOSB said they were informed by the International Olympic Committee (IOC) on Thursday evening and a disciplinary commission would convene later in the day after the B sample has been tested."

You can follow all the action in Sochi with our dedicated live text commentary.

The Premier League returns this weekend after what feels like an age. Some teams including Manchester United and West Ham have enjoyed a mid-winter break in the sunshine so it will be interesting to see if they pay-off.

We'll be looking ahead to the action and hearing from all the key protagonists including Arsene Wenger, Manuel Pellegrini, Jose Mourinhno, David Moyes and Brendan Rodgers who all hold press conferences today.

First up is the Arsenal boss who we'll be bringing you from 09:00 GMT.

Former Wigan winger Martin Offiah says beating the Sydney Roosters in Australia on Saturday would be this Warriors side's "greatest achievement".

"It will be a baptism of fire and something that will make or break this Wigan side," he told BBC Sport.

Mesut Ozil has apologised after missing a penalty in Arsenal's 2-0 Champions League defeat by Bayern Munich.

The Gunners have a mountain to climb in the second leg at the Allianz Arena on 11 March, but things could have been so different had Ozil converted his spot-kick to open the scoring at the Emirates on Wednesday.

Ozil wrote on his official Facebook account: "the next morning doesn't feel better either. sorry guys - it wasn't planned that way. outnumbered, it was really hard to win against this team."

Here are some of the top stories from today's football gossip column.

Turkish club Besiktas are lining up a summer move for Manchester United's 24-year-old Japan international midfielder Shinji Kagawa.(Manchester Evening News), external

Former England captain David Beckham has targeted signing Barcelona midfielder Xavi, 34, for his new MLS soccer franchise in Miami. (Daily Mail) , external

Arsenal goalkeeper Wojciech Szczesny, 23, is unlikely to face sanction for the obscene gesture he made as he exited the pitch following his dismissal in the Champions League defeat to Bayern after the referee did not include the incident in his report.(Guardian), external

First of all the news from overnight and top seeds Justin Rose, Rory McIlroy and Henrik Stenson are all out of the WGC Match Play Championship while second seed Jason Day needed four extra holes to advance.

World number seven McIlroy was beaten at the 19th by American Harris English, while US Open champion Rose, the final Englishman left in the event, lost at the 20th hole to veteran Ernie Els.

Hello and welcome to Friday's Sportsday Live from the BBC Sport Centre where we will keep you up to date with all of the day's events and look ahead to a busy weekend of sporting action.

As well as a full programme of Premier League and Football League action, there's also the Six Nations, Rugby League's World Club Challenge and, of course, the culmination of the Winter Olympics in Sochi.