Son Heung-min stunned the Emirates by firing Spurs in front with the aid of a deflection, but Arsenal hit back with two goals in four minutes to take a lead into the break.
Brazilian teams Santos, Palmeiras and Sao Paulo have all been monitoring his situation, while Olympiacos and MLS side Charlotte FC have also enquired about Almiron's availability.
Havertz, 25, missed a penalty in Arsenal's shootout defeat at the Emirates on Sunday before his partner, Sophia reposted two abhorrent messages she had received on Instagram.