Portland Timbers have warned Celtic that Darlington Nagbe is not for sale.
The attacking midfielder was at Celtic Park on Wednesday night to watch the Hoops crash out of the Champions League with a 2-0 defeat to Barcelona.
Nagbe was blown away by the rocking atmosphere and hailed the fans on social media.
Reports earlier this week claimed he would be available for around £1.5million.
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But he is contracted to the MLS outfit until 2019 and Portland chiefs say that falls way below their valuation for the 26-year-old.
A fee nearer £2m would be more palatable for Portland to accept should Nagbe demand a move to the Hoops.
However, a club official has told American newspaper The Oregonian “we expect Nagbe to be with the Timbers in 2017”.
Another also claimed he was “just visiting” Celtic.
US international Nagbe has scored 24 goals for his side, with 25 assists.