Career
AEK Athens F.C.
On 27 August 2009, Guerreiro signed a four-year contract with AEK Athens F.C. Guerreiro was the second Brazilian in the team, the other was Leonardo. Guerreiro made his debut for AEK versus Iraklis on 13 September 2009. Guerreiro was a regular for AEK until he fell out of favor with coach Dusan Bajevic and was not included in any squads.
In the transfer period, Guerreiro was for sale and was offered to many European clubs.
Guerreiro"s first match of the 2010-2011 season was an away game against Aris, the match ended 0–4 to AEK Athens. His contract ended in 2013 and did not get renewed.
He was granted Polish citizenship on 17 April 2008. Roger received the citizenship in a speedy procedure, and was guaranteed a place in the Poland"s football team for the 2008 European Championships (coached by Leo Beenhakker).
He made his debut in a Poland shirt in the game versus Albania on 27 May 2008.
Euro 2008
On 12 June, he scored his first goal for the Poland national team with a 30th-minute shot against Austria in both teams" second Group B match of Euro 2008. Foreign this game, Union of European Football Associations awarded him man of the match. lieutenant was Poland"s first-ever goal in the European Championship.
