The 23-year-old has attracted interest for some time and the Bhoys will reportedly have to brace themselves for more of the same in the coming months.
Indeed, the Mail suggest Southampton and Sunderland are after the Dutchman, while Arsenal and Everton are also interested.
Celtic, however, will not budge on an asking price of £10 million, with bids just below that of around £8m set to be firmly rebutted.
The Mail quote Deila as affirming that the Bhoys will not do business under the asking price and he has certainly expressed his desire for Van Dijk to remain at Parkhead beyond the current campaign.
Understandably, the Norwegian is full of praise for the talented Celtic defender, who he believes has bags of potential at the age of 23.
As history has proven, though, the Hoops have been willing to do business at the right price, as the Scottish champions have a good track record when it comes to finding replacements.
Van Dijk is one man Celtic will no doubt hope they can hold on to for another season at least, however.