The big striker, 28, is just in through the door at Ibrox with the Gers paying a reported £1.8m to sign the Croatian international from Greek outfit PAOK this summer.
But so far the jury remains out on the striker who has been a fixture of the Rangers team in pre-season due to injuries to fellow forwards Alfredo Morelos and Kemar Roofe.
One school of thought suggests it’s too early to judge the striker – and objectively it is – with plenty of sympathy towards the Antonio Colak’s situation in the squad at present.
But another suggests that the forward should be ready to make an impression at Rangers in terms of scoring goals and that the Champions League qualifiers are precisely why the striker was signed.
This is after Antonio Colak netted a double to down Rangers with Malmo at Ibrox last season and send the club tumbling from the Champions League qualifiers.
Antonio Colak subject to criticism after Rangers defeat
After the Ibrox side fell to a dispiriting 2-0 defeat to Belgian club Union Saint Gilloise in the first leg of a QR3 Champions League tie this week, few players have been safe from the wrath of the fans.
And Antonio Colak – without a goal in two competitive Ibrox games even if his disallowed effort v Livingston should’ve stood – is under increasing scrutiny.
Mark Hateley, himself notoriously enjoying a difficult start to life at Rangers, didn’t help matters when he publicly criticised the striker this week by branding him a “waste of time”.
“It was a poor, poor show. Weak and blunt,” Hateley said of Rangers’ performance on BBC Sportsound.
“We don’t even know if Union’s back three are any good.
“Is the goalkeeper any good? We don’t know. Union figured Rangers out after 25 minutes.
“At the end of the day, Rangers are very, very lucky to come away with a 2-0 defeat.
“You could see a second goal coming all second half. Then you worry about the third goal.
“Colak, for me, was a waste of time. If Morelos is playing there, the ball goes into him. Colak didn’t demand the ball.”
To some Rangers supporters, these comments are harsh given Antonio Colak is only in through the door but to others it is a fair representation of his contribution so far.
Until the striker starts to score goals and help an over-reliance on Alfredo Morelos, the debate will continue to rage, but at present there can be no denying his start to life at Rangers is yet to set the heather alight.
Rangers fans remain fuming at not only the result but the performance against USG and the players are going to have to suck up the criticism.