The Bhoys had been linked with making a move to sign Fletcher for much of the summer transfer window, with Ronny Deila keen to take the Scottish international on loan.
Sunderland were said to be open to sanctioning his departure earlier in the summer, but with Celtic holding off making an offer until right at the end of the window, it is clear that the Black Cats had changed their stance on the transfer of their forward.
It is stated in the report that Fletcher, 28, was keen on returning to Scotland to link up with Celtic, but the Wearside club rejected Celtic’s approach in the final hours of deadline day.
Despite bringing in Fabio Borini, and also having Jermain Defoe and Danny Graham to call upon in a lone striker formation, head coach Dick Advocaat clearly believes Fletcher has a role to play at the Stadium of Light this season, and wanted to ensure the forward did not leave the club on the final day of the transfer window.
Celtic were in the market for a new striker signing over the summer, with only Nadir Ciftci and Leigh Griffiths to call upon this season.