Middlesbrough are facing a fight to hang on to Dutch striker Jimmy Floyd Hasselbaink.
The 34-year-old, who is out on contract at the end of the month, is being courted by a series of potential employers as new Boro boss Gareth Southgate attempts to tie up his future.
Reports over the weekend suggested that Scottish champions Celtic are among the interested parties, although Hasselbaink's agent Humphry Nijman was giving little away today.
Nijman said: 'The only thing I can say is there is some interest from different teams and we will have to wait and see what it's going to bring.
'There is some interest from Scotland, but the name of the club has not been given to me.
'We have not been approached directly and will have to wait until something is concrete. At the moment, that is not the case.'
Southgate signalled his intention to speak to Hasselbaink after being unveiled as manager, and it is understood he has already done that.
The length of contract on offer could be the problem with Boro understood to be prepared to give him only 12 months.
Hasselbaink is confident that he still has a good two years left in his legs, saying before last month's UEFA Cup final: 'I feel I can play two more years.
'I'm fit, and although sometimes I need more than a day to recover, I definitely feel I can score more goals at Premiership level.'