Sissoko has been linked with a move away from Newcastle all summer
Sissoko looks set to leave Newcastle this summer
The Frenchman has been linked with a move away from St James' Park ever since their relegation to the Championship was confirmed at the end of May, but has so far failed to secure a transfer.
Everton have become the latest club to reportedly hold an interest in the midfielder, although Spanish giants Real Madrid were also thought to be mulling over an offer earlier in the summer.
United are seemingly determined to stick to their asking price of €40million, but the Newcastle Chronicle claims the Magpies are becoming increasingly concerned that Sissoko's uncertain future could be having a negative impact on their Championship campaign.
The newspaper claims that Sissoko's representatives will meet with officials from both Everton and Inter MIlan this week in Paris, with hopes high that a resolution will be found before the close of the transfer window.
But despite their apparent willingness to sell, the club still found time to wish the midfielder a happy birthday on social media platform Twitter, with Sissoko turning 27 on Tuesday.
Newcastle United FC (@NUFC) August 16, 2016
However, the club's fans were not quite so nice.
@NUFC Hope he stubs his toe just after standing on his iPhone charger plug— Mark McMeekin (@McMeekinM) August 16, 2016
@NUFC hope someone buys him the game he always wanted...for the wrong console— fatbloke (@fatbloke70) August 16, 2016
Given that birthdays can be quite important to footballers - just ask Yaya Toure - the messages may well leave Sissoko all the more determined to leave Tyneside.