Antonio Valencia believes Manchester Uniteds struggles this season are down to the sheer volume of injuries Louis van Gaal has had to cope with. The Ecuador international has endured another frustrating season with injuries, having just made his comeback from a foot injury that has kept him out of action since the end of October.In his absence, United have struggled and sit sixth in the table, with pressure mounting on Louis van Gaal to at least steer the club back into the top four. Valencia is not the only member of the United playing staff to have suffered injury setbacks this campaign, with Bastian Schweinsteiger the latest to be ruled out.And with so many key players frequenting the treatment room, Valencia believes anyone would have struggled with so few fit players.It has affected the way the manager has had to work, Valencia told Sky Sports News HQ. Your hands are tied. If you have a squad of 20 players, and ten are injured, then you are having to work with half a squad. Manchester United manager, Louis van Gaal, has set his sights on a top three Premier League finish It is not just short term injuries either. You look at Luke Shaw, myself, Wayne Rooney, we have been out for a long period.The bad form that we have had in that time has to be down to the amount of injuries that we have had.That is bound to affect performances, but now we are getting people back, we need to focus and really fight for the place in the Champions League. Marcus Rashford opens the scoring for Manchester United at the Etihad It is also down to the Premier League, it is tough league. One week you can play very well, and then the next week you are up against a team you are expected to beat, one that is fighting relegation, and they turn it on.Valencia also admitted that this frustration does not just stop with his lack of playing time, but seeing United struggle has also been hard to take.Both mine and the teams seasons have been disappointing. I have been down and sad about being out of action for five months, and a lot has happened in that time. Jamie Redknapp gives his thoughts ahead of Super Sunday as Leicester face Southampton before Everton travel to Old Trafford to face Manchester United Under Sir Alex Ferguson we were used to winning trophies year after year, so it does hurt to see others doing it now, but we have to accept that this profession that we work in is like that, there are ups and downs.Every new season is like a new dream, and we will be fighting to do much better for the fans next season.We have got to be looking to win every game to make sure we are in the Champions League next season, and I believe we have the players in the squad, and an excellent manager to be able to make that happen.By purchasing a Sky Sports Day Pass for £6.99 or Sky Sports Week Pass for £10.99, you can enjoy access to all seven Sky Sports channels and watch on a TV with a NOW TV Box or on a range of devices. 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Mick Fanning has capped an extraordinary return to the scene of last years shark attack, winning the World Surfing League event at Jeffreys Bay, South Africa.Fanning fought off what was believed to be a great white shark in the disbanded contest final of 2015, eventually fleeing the water uninjured with fellow Australian Julian Wilson.On Saturday Fanning beat Hawaiian John John Florence in the final after taking out good friend Wilson in the semi-final.In variable small swell, which saw the contest drag into its 11th day, Fanning beat Florence 17.70 points to 17.13.Florence had beaten another Australian, Josh Kerr in the other semi-final.An almost zen-like calm enveloped Fanning after the decider, the 35 year-old speaking in relaxed tones of his relationship with Wilson.Hes just one of those guys that always has your back, Fanning said of Wilson, who came to his aid when the shark began to circle the three-time world champion.As for the enormity of winning in such emotional circumstances, Fanning said hed made an early call to come back to J-Bay and was always going to stick by it.That was always the intention to come back - to right the wrongs of last year, he said.Now we have, we can move on.It just feels a lot lighter not going for the world title andd not having that pressure on.ddddddddddddFanning, on a reduced schedule this year after a difficult 12 months that included the shark attack, death of his brother and break-up of his marriage - overcame even more complications on the eve of the round six event after hurting his ankle while free-surfing.He was even seen wearing a moon boot after the mishap though showed few signs of injury in a fluid three rounds on Saturday in which he beat Brazils Filipe Toledo, Wilson and then Florence to snatch his first win of the season.In what he labelled his personal year Fanning has thus far surfed in four of the six events, until Saturday securing a best finish of third at Bells Beach, Victoria.Despite the win, Fanning confirmed he would only surf one more event this season.Ive already said Ill go to Trestles (California) and that will be my last event of the year, he said.World titles arent the biggest thing for me any more.Fanning, who went from 16th to fifth in the world rankings with the victory, was watched from the shore by his mother, Elizabeth Osborne.Australian Matt Wilkinson still leads the mens standings after six events. 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