Henrikh Mkhitaryan has suffered a thigh strain, Inter have confirmed.
Mkhitaryan made his Inter debut in the 2-1 win at Lecce last Saturday after joining from Serie A rivals Roma.
The former Borussia Dortmund, Manchester United and Arsenal midfielder came on in the 57th minute of a game that saw Inter claim a last-gasp winner through Denzel Dumfries.
However, they could well be without his services for their home game with Spezia on Saturday following an early injury blow.
A statement on Inter's website said assessments on Mkhitaryan had revealed a "strain in the left thigh flexors" and he will be "reassessed in the coming days".