The Mirror reports Chamakh has been questioned by French police in a money-laundering probe.
And the Morocco international, who is joining the Gunners on a Bosman free transfer from Bordeaux, was branded "foolish" during a trial that saw a man jailed for two years.
A court was told the French-born striker allowed his friend Patrick Felici to use his bank account to transfer money to Morocco.
Bar owner Felici opened the L'Ho de La restaurant in Agadir, but investigators found he had used almost £1.5million in laundered funds to set it up.
Felici was charged with aggravated money-laundering, abuse of public funds and breaches of employment laws - and given a two-year prison term with 18 months suspended.
Prosecutor Alain Benech said: "Marouane Chamakh played the role of bag-carrier in this case. However, he behaved in a foolish way."
Chamakh was not charged but his involvement in the case will concern Arsenal boss Arsene Wenger, who has pursued the striker for over a year - as well as a Gunners board eager to maintain the club's reputation.