Greg Taylor has arrived to Celtic from Kilmarnock to get an additional fee.
The two clubs agreed a fee on Monday for the left-back.
Taylor has already had his medical with the champions as all parties attempt to finish a bargain.
The Scotland trained using the national team on Monday afternoon in front of a breakthrough was made between the two clubs.
It’s understood Celtic defenders Calvin Miller and Jack Hendry will not proceed to Kilmarnock within the offer.
League One Bolton had made a enquiry to get Hendry but couldn’t find a deal.
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