Lionel Messi claims Argentina will improve despite unconvincing displays in the two victories that secured their passage to the knock-out rounds.

After a trademark goal that ensured a 2-1 win over Bosnia-Herzegovina in Argentina's opening match, Messi came to the rescue again against Iran on Saturday, scoring the only goal in injury time.

After that "wonderful moment", the Barcelona idol said: "If we analyse both matches we might say we can play better but as we progress in the tournament we will improve and reach our full potential. We know we are not playing as well as we are expected. But we have qualified for the next round and that was our first objective."

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Argentina will meet the runner-up from Group E - likely to be either Ecuador or Switzerland - in Sao Paulo if they top Group F.