The Argentine joined Barca on a free transfer during the close season, but made only five appearances in all competitions due to a calf injury and his cardiac issues, scoring once in a 2-1 home defeat by Real Madrid.
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The 29-year-old missed the last three ManchesterCity games and both of Argentina's World Cup qualifiers earlier this month following his road traffic accident in the Netherlands.
Sky Sports said that the 31-year-old Argentine was on his way to City's training facility in his car when the accident occurred.
He has been rumoured to join Barcelona in the summer transfer window.
Manchester City striker Sergio Aguero and goalkeeper Joe Hart could return from injury in time for Saturday's Premier League game against Stoke City, manager Manuel Pellegrini has said.
Tottenham Hotspur striker Harry Kane was named player of the month after scoring six goals in four league games.
'Whenever I talk with Leo, we always say 'Pray that one day it happens for us'. It's what he wants and it's what we all want. I put myself in his shoes and I want to do the best'
"Sergio Aguero will be assessed by Club doctors today after being involved in a road accident on Thursday," City said of the Argentina striker in a statement on their website. (www.mancity.com)
Real's Cristiano Ronaldo will be going in search of his third consecutive World Player of the Year award
Wednesday night saw a few surprise results while a debutant club makes a mark
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