Get the biggest City transfer window stories, analysis and updates delivered straight to your inbox Ronald Koeman says Barcelona need to help Sergio Aguero find a level higher than in his final season at Manchester City if they are to reap the rewards of the new signing.
The La Liga giants swooped to sign the City striker on a free transfer this summer after Pep Guardiola took the decision not to give the club record scorer a new deal following a year of struggling for form and fitness.
Aguero came off the bench to score two goals in his final Premier League game in a fitting farewell, but was not in contention to start the Champions League final against Chelsea after so long away from the first team squad.
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