The Hungary international, who also had spells with Portsmouth and Blackpool, now plays for Hajduk Split.
Futacs was allegedly attacked on Monday, the day after his club lost 2-1 at home to Croatian title rivals Dinamo Zagreb.
Reports claim the 28-year-old and his team-mates were walking past a building owned by Hajduk's Ultras fan club Torcida.
The players are said to have been set upon by a group of thugs after defending one of their friends against criticism.
And Croatian media revealed Futacs was left with a cut below his eye after being kicked during the bust-up.
Hajduk said in a statement: "We strongly condemn the attack on our players in the centre of Split, where our player Marko Futacs was injured.
"We expect to quickly determine the circumstances of this nasty event from the authorities, and the club will take all measures to protect its players.
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"No form of violence should be tolerated."
Local police have launched a probe into the incident, while the Torcida club made a public apology.
Spokesman Damir Gruic said: "Torcida is sorry for the incident, in which Hajduk players also participated.
"This way of expressing dissatisfaction with the Hajduk players is unacceptable to us."
Hajduk's defeat left them eight points behind leaders and arch-rivals Dinamo with just five games remaining.
Futacs spent his entire English career in the Championship between 2011 and 2014, totalling 45 appearances and seven goals for Pompey, Leicester and Blackpool.
He went on to play for Hungarian side Diosgyor and Turks Mersin Idmanyurdu before joining Hajduk in 2016.
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