Kabak, 19, only joined Stuttgart from Galatasaray in January, but impressed enough in his brief spell in Germany to earn the Bundesliga Rookie of the Year award.
The Turkish centre back suffered relegation though, and that means that he can now be signed for just €15million (£13million) thanks to clause in his contract.
That's unsurprisingly attracting interest, and Milan are allegedly talking to his representatives about a potential move to the San Siro this summer.
That won't be what West Ham were looking to hear, as The Guardian claim that they want to activate that clause in his contract too.
Kabak will want to sign for a club where he can play first-team football judging by his move to Stuttgart, and West Ham may be the best option for that desire.
However, with a European giant like Milan – who may have fallen away in recent years but are still a huge club – interested, West Ham now face a tough battle trying to bring the teenager to East London.
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