Go Ahead Eagles sporting director Jan Willem van Dop has urged Celtic to follow Rangers' example and get transfer deals done quickly.
The Dutch club sold winger Oliver Antman this week to Rangers in a £4.4 million deal and he made an immediate impact as Russell Martin's side romped to a 3-0 first leg victory over Viktoria Plzen in the third qualifying round of the Champions League.
Celtic were also after a Go Ahead Eagles key man, but their initial £1.5 million offer for Danish star Jakob Breum was immediately rejected, with reports in the Netherlands suggesting the Eredivisie club want £6 million for him.
And van Drop has compared the Glasgow giants' transfer dealings.
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He said: "There was some interest from Celtic for Jakob Breum, but we felt the gap was too wide.
"Things moved very quickly with Oliver Antman and Glasgow Rangers.
"Celtic could have taken a leaf out of Rangers' book, ha ha."
Breum picked up an ankle injury in last week's Johan Cruyff Shield and missed last night's game against Fortuna Sittard, but boss Melvin Boel has indicated he will return next weekend.
