Noel Whelan says he's been left 'questioning' whether Carl Starfelt was 'a good signing' for Celtic.
The former Leeds United, Coventry City and Middlesbrough forward was speaking to Football Insider.
The lowdown
Celtic signed Starfelt from Russian outfit Rubin Kazan for a fee of £4million back in July.
He joined the Hoops on the same day that Kristoffer Ajer left for English Premier League outfit Brentford.
Starfelt wasn't the only addition to Celtic's centre-back ranks, with Cameron Carter-Vickers and Liam Scales arriving from Tottenham Hotspur and Shamrock Rovers respectively.
The Swede struggled in Thursday's Europa League defeat at the hands of Bayer Leverkusen at Celtic Park.
The Daily Record's Craig Swan handed him a rating of just 5/10 for his display, saying he was 'never comfortable on the ball'.
The latest
Whelan says that Starfelt hasn't had the impact that would have been desired at Celtic Park.
He's been told he needs to step up if he's to justify Celtic's outlay.
"They brought in new players this year, Starfelt being one of them," he said. "You expect them to turn the tide.
"Now you're questioning was it a good signing? Is he the right man for it?
"Because performances need to be a lot better from a player of that standard. You can't hide away when you’re out there on the field, everyone sees it."
The verdict
Starfelt is effectively playing for his place right now, with Christopher Jullien's return on the horizon.
When everyone is fit, you'd have to say Carter-Vickers ought to be starting alongside the Frenchman.
It was worrying how cautious Starfelt looked on the ball against Leverkusen. It doesn't really chime with Postecoglou's philosophy whatsoever.
In other news, read Kieran Devlin's worrying line on Postecoglou.