Hammarby sporting director Mikael Hjelmberg says Celtic's final bid for Sebastian Tounekti was so lucrative that the Swedish club couldn't turn it down.
The Bhoys completed a late deal for the Tunisian winger, who penned a five-year contract at Parkhead on transfer deadline day.
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Hammarby never wanted to sell Tounekti, although when Celtic came in with a bid reported to be in the region of £5.2million, they couldn't say no.
"Our ambition has always been to keep Sebastian during the summer window," Hjelmberg told Hammarby's official website. "But Celtic’s final offer was so lucrative that we weighed the financial aspect against what we would lose in sporting terms.
"With the options we have in our attacking positions, as well as Sebastian’s own wishes, we believe that the best thing for Hammarby is to accept Celtic’s offer.
"He has made huge strides since joining us last winter, which is a testament to the development environment we have in our organisation and an equally good testament to our scouting activities, as we identified and brought in a player who has delivered at such a high level from the start.
"We wish Sebastian the best of luck."