The AFL says Sydney did not break any rules when they cleared onballer Josh Kennedy to return to the field after undergoing a concussion test in Saturdays qualifying final.Kennedy was checked by doctors but allowed to play on after copping a shoulder bump to the head from Greater Western Sydney forward Steve Johnson in the first quarter of the ANZ Stadium clash.The Swans were asked to provide more information about the incident but AFL football operations manager Mark Evans on Thursday said the club had not breached the rules.Evans said Kennedy had passed concussion tests during and after the game and had shown no ill effects since.The Swans told the AFL they were unable to immediately access footage of the incident on the interchange bench due to technical issues, and had also been managing an injury to ruckman Kurt Tippett at the time.The AFL intends to expand the Hawkeye medical system to all major venues next year to help clubs immediately assess injuries after successful trials at the MCG and Etihad Stadium.Johnson accepted a one-week suspension over the careless bump on Kennedy and will miss the Giants September 24 preliminary final against either Hawthorn or the Western Bulldogs at Spotless Stadium.Concussion has become an increasingly-important issue in contact sports worldwide.The AFL fined Port Adelaide $20,000 in July after it ruled the Power let Hamish Hartlett return to the field too quickly after a head knock.Half the fine was suspended until the end of the 2018 season.It is understood the AFL has also formally asked other clubs to outline how they have handled concussion tests.The AFLs 2015 injury survey showed games missed due to concussion continue to soar as clubs become more conservative about how they manage head knocks.Fake Vans Cheap . 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Fake Vans . -- Matt Ryan needed one of the best games of his career to lead the Falcons and their depleted offence out of their three-game losing streak last week.Aston Villa are an embarrassment and should be classed as one of the worst teams in Premier League history, according to Jamie Carragher.The Sky Sports expert delivered his damning verdict following Liverpools 6-0 thrashing of Remi Gardes side at Villa Park on Sunday afternoon.Goals from Daniel Sturridge, James Milner, Emre Can, Divock Origi, Nathaniel Clyne and Kolo Toure condemned Villa to their heaviest home league defeat since 1935, leaving them eight points adrift of safety with 12 games left to play. And Carragher insisted the team that played on Sunday simply arent Premier League class.They are an embarrassment and they have been for a few years, he said on Super Sunday.It wont be that team in the Championship, theyll change it obviously, but if that team is in the Championship it will be closer to the bottom than the top - theres no doubt about that.I was thinking about how difficult it is for young kids. The dream is to play in the Premier League. If you watch Aston Villa it gives you hope with how that group of players are playing in the Premier League, at that level. James Milner celebrates with team-mates after his cross found the bottom corner for the second goal I always think when teams go down theres always two or three players where other managers in the Premier League will try and take them.I cant imagine one Premier League manager looking at that team and thinking theres one player there hed want to take into his squad. Thats how poor they are.Liverpool led 2-0 at half-time and even before the avalanche of second-half goals, Carragher described Villa as the worst Premier League side he could remember.They will finish with more points than the Derby side of 2007/08 and the Sunderland team of 2005/06, but Carragher says they have been sliding to this level for several years. A dejected Remi Garde reflected on Aston Villas 6-0 loss to Liverpool I said at half-time they are one of the worst Ive seen and was reliably informed Derby and Sunderland may be the worst, he added.Forget about what points they are on, I think they are the worst Ive seen. I cant remember those seasons. Thats as bad as youre going to see. I cant imagine one Premier League manager looking at that team and thinking theres one player there hed want to take into his squad. Thats how poor they are. Jamie Carragher I think weve known for a long time they are going down, not because of where they are in the league but because they are the worst team in tthe league.dddddddddddd Thats why they are going down, nevermind being bottom.Its been coming for a few years, really. Ive been watching the games for Sky and have been surprised theyve stayed up. Christian Benteke has kept them up for two or three years, but with him gone, theyve had no chance.They are one of the worst teams in the Premier League. Divock Origi was mobbed by away fans after his goal Carragher also argued Liverpool have been average for much of this season, but says the return of Sturridge and Philippe Coutinho from injury has elevated them to a higher level.He said: Brendan Rodgers could look back and say the injuries to Daniel Sturridge maybe cost him his job. Thats how much he elevates this Liverpool team.Without him and Coutinho, its an average team and weve been watching that for the last few months. Liverpool manager Jurgen Klopp was full of praise for his team Were expecting Jurgen Klopp to come in and make a difference, but I think he said in the week hes not David Copperfield. You need top players.Thats what Liverpool have. They havent got that many of them, but the one true one they have is too injury-prone and thats the problem for them.If they can keep him fit between now and the end of the season, you would expect a good run. Liverpool midfielder James Milner feels that their 6-0 win over Aston Villa was an overdue result Are Aston Villa the worst team in Premier League history? Have your say in the comments box below or tweet @SkyFootball.Also See:Villa hit for sixGarde on Villa spiritAs it happenedMatch stats ' ' '