Santon, aged 27, came off the bench for the last few minutes of Inter’s 3-2 home defeat to Juventus on Saturday.
A fiery affair saw Inter’s Matias Vecino shown a straight red card for a studs up challenge.
Then with Inter 2-1 ahead against the potential Serie A champions, Milan Skriniar scored an 87th minute own before Gonzalo Higuain pounced in the 89th to give Juve the win.
Home fans blamed Santon for both goals.
The couple were subjected to a torrent of abuse on social media
Santon was blamed for allowing Juventus back into the game on Saturday
He and Chloe saw their social media accounts bombarded by aggressive, even violent messages from Inter fans.
They apparently included death threats and wishes for them to get cancer.
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Chloe wrote on Instagram: “Football is a sport of passion. I understand and appreciate that.
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“But for the first time in my life I am scared in my own home alone with my baby…
“When I’m told to lock my doors and I have to worry how my partner will get home tonight.
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“It’s not okay. No one is more devastated about the result than Davide.”
Italian Santon played for Newcastle between 2011-15 and made 88 starts.
He was initially loaned back to former club Inter before the Italians grabbed him on a free transfer in 2015.
FORMER Newcastle United defender Davide Santon and his partner Chloe Sanderson received death threats after Inter Milan’s 3-2 home defeat by Juventus. The situation left Chloe telling her Instagram followers that “for the first time in my life I am scared in my own home alone with my baby”. Davide Santon and Chloe Sanderson received…