Greece beat Russia 1-0 with a first-half goal from captain Giorgos Karagounis to reach the Euro 2012 quarter-finals on Saturday, a result that sent the Russians home after the Czech Republic beat co-hosts Poland.
Lionel Messi, who turns 23 on Thursday, captained his country for the first time on Tuesday and gave another virtuoso performance as Argentina beat Greece 2-0 to reach the second round of the World Cup.
Nigeria are keeping everyone guessing about their plans for the World Cup Group B match with Greece on Thursday, training in seclusion on the Indian Ocean coast since their defeat by Argentina.
Greece will go into the Euro 2012 last eight with a sense of pride but must keep a cool head after a roller coaster group stage saw them move from the brink of elimination to the knockout phase with a 1-0 win over Russia.