Manchester United Head Coach Jose Mourinho was spotted in Tivoli-Neu, Innsbruck where Austria played host to Russia in an International Friendly Match.
The Austria star may be a surprise target for the Red Devils, after Mourinho watched the West Ham forward as Austria claimed a 1-0 win against Russia.
It is understood that that Mourinho wants more fire power and height in attack, after United managed to scored once in their last four games of the season without Romelu Lukaku.
Arnautovic have previously played under Mourinho during an unsuccessful loan spell at the San Siro in 2009, were he made only three appreances.
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