Nigeria captain John Obi Mikel admits his side have to improve quickly if they are to make an impact at the World Cup after they lost 2-1 to England in a friendly at Wembley on Saturday.
Nigeria were punished for a dismal first half display as goals from Gary Cahill and Harry Kane put England in control.
Arsenal’s Alex Iwobi pulled one back for the visitors after the interval, but Nigeria couldn’t find an equaliser despite their improved second half performance.
Mikel knows Nigeria have to sharpen up in Russia if they to get through a tough group featuring Argentina, Iceland and Croatia.