The Swiss international’s future has been thrown into doubt recently after he spurned the offer of a new contract.
As a result, he is believed to be available in January at a knockdown rate, with a £3.5m bid rumoured to be enough to convince Basel to sell.
This has alerted the Premier League duo, who have both been impressed by Sommer.
Spurs chief Andre Villas-Boas is thought to be a long-term admirer of the stopper, and sees him as the ideal man to replace veteran USA star Brad Friedel.
The experienced campaigner is now 42-years-old, and is unlikely to remain Hugo Lloris’ backup for much longer.
Sommer is seen as somebody who can provide the Frenchman with a greater challenge, and at 24 he is also a long-term investment.
Newcastle are also keen, as the club step up their transfer plans after a woeful summer in which Loic Remy was their only signing.
Speculation surrounding Tim Krul is also a factor, with the Magpies aware that a number of top European clubs are monitoring the Dutchman.
Could Yann Sommer be a Premier League star?
Tell us what you think below!