The 20-year-old Spaniard moved his tally for the season into double figures with a late equaliser at Liverpool as the Gunners fought back to secure a deserved 1-1 draw to return to the top of the Barclays Premier League table.
Gallas said: "He can be the best player in the league. To be the best you have to be good during one season and the season is very long. Cesc has to save his energy, but he can be the best player."
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