The agency questioned him on various aspects of the case including his alleged links with middlemen, his alleged trips to Italy, reasons behind changing specifications, and relations with his cousins on Monday, the sources said.
A summary of sports events and persons who made news on Thursday
With the year sprinting to a close, we bring you, in pictures, some of the best action from the sports world.
Croatia clinched a place in next year's World Cup finals on Sunday after holding Greece to a goalless draw at the Georgios Karaiskakis stadium in Athens to complete a 4-1 aggregate victory in their playoff tie.
Juventus did the bare minimum as they scraped into the Champions League knockout stage on Tuesday with a 0-0 draw at home to Atletico Madrid, a result which also suited the Spaniards who topped the group.
Germany defender Nico Schulz scored a late winner as their new-look side snatched a 3-2 win away to the Netherlands in their opening Euro 2020 Group C qualifier on Sunday, an absorbing clash that swung in fortunes from one side to the other.
News of all that's transpired on and off the football field
Germany's Thomas Mueller struck twice as the nervy world champions kicked off their Euro 2016 qualifying campaign with a 2-1 victory over Scotland on Sunday.
IMAGES from the Euro 2020 qualifiers played on Thursday
A headed goal in second-half injury time by Cristiano Ronaldo gave Portugal a much-needed 1-0 win over Denmark in their Group I Euro 2016 qualifier on Tuesday.
Barcelona must to wait to confirm a place in the Champions League last 16 after dropping points for the first time in Group D in an absorbing 0-0 draw at Olympiakos Piraeus on Tuesday.
Two goals from Thomas Mueller and one from substitute Mario Goetze helped Bayern Munich kick off their Champions League campaign with an impressive 3-0 victory over Olympiakos.
A summary of all the Champions League matches played across Europe on Tuesday
Wales continued their unbeaten start to the Euro 2016 campaign as a nervy 2-1 triumph over Cyprus, after they had been reduced to 10 men, bolstered the nation's dream of qualifying for a major championship finals for only the second time.
Jose Mourinho's Chelsea turned from domestic whipping boys back to European stalwarts on Wednesday, beating his former club Porto 2-0 to top Champions League Group G.
