Alexis Sanchez has given Arsenal fans a reason to worry ahead of next season after admitting he felt 'tired' after Chile's opening Copa America game against Argentina.
The flying forward failed to play at the level that we have come to expect and could not stop Argentina running out 2-1 winners in their opening group games.
The holders now face a fight to make it into the knockout stages and must beat Bolivia on Saturday to maintain a chance of doing so.
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And if they are to retain their trophy, Sanchez will have to rekindle the kind of form that convinced Arsenal to pay £35m to sign him from Barcelona.
But a tough season in north London, coupled with a third successive major international tournament, means the 26-year-old has not had a proper summer break since 2013. The result? He is already feeling fatigued just one game into the competition.
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“I’m tired,” he said. "I could not sleep after the match with Argentina. It was demanding. I hope to recover and get my enthusiasm back in the game against Bolivia.
“I hate to lose, even to Argentina, who are a world power. I think about the game [all night]. I only slept for about four hours.”
But, as always, Sanchez is determined to prove his worth and says Chile will be playing at 200% to get their campaign back on track.
“We have two games with tough opponents, but I have faith that we will pass through to the next round.
“I know how far we can go. We’ll continue with the same mentality. But we must go a step further to win games.”
Last summer Sanchez returned to Arsenal late after Chile went all the way to the final and was unable to start their opening Premier League game against West Ham, which they lost 2-0.
While Arsenal fans will be hoping to have Sanchez back and raring to go ahead of the new campaign, club legend Ray Parlour is worried that he may not be at the Emirates.
Indeed, Sanchez is one of Arsenal's best players and it is rumoured their failed Premier League title bid has left him dissatisfied with the prospect of future titles.
"I was a little bit worried about him come the end of the season," he told talkSPORT.
"Will he want to move on and go somewhere different? He’s top quality and you want to keep those sort of players if you’re going to be looking at the title next season."