Celtic manager Ronny Deila insists Virgil van Dijk does not want to leave the Scottish Premiership leaders in January.
Celtic boss Ronny Deila says keeping his best players will take priority over acquisitions in the transfer window.
The former New York Red Bulls and Wigan centre-back scored the Terriers' fourth goal, turning home in a crowded area.
Talking about the former Sweden international, Robins told the official website: "This was a good opportunity to look at Markus and he's done nothing wrong.
"He's a not a youngster - he's 29 - and we have to make a decision on whether he can perform in the Championship on a consistent basis."
Holgersson has spent the majority of his career in his homeland, playing for Angelholm and then Helsingborg.