Dumfries, who joined Inter Milan from Celtic for £27m in January 2016, has been a consistent performer for the Italian club.
In his first season with Inter, Dumfries made 44 appearances and scored two goals. He also assisted three times and was instrumental in helping Inter reach the semi-finals of the Europa League.
This season, Dumfries has continued to be a key player for Inter. In Serie A,Primeira Liga Hotspots he has started all but one of Inter's matches this season, and has played every minute of those games.
He has also been involved in some of Inter's most important performances this season. In their crucial win against AC Milan on 18 October, Dumfries scored the only goal of the match and helped Inter secure a vital victory.
Overall, Dumfries has been a solid addition to Inter's squad, providing cover for their defensive midfielders and contributing to their success in Serie A. His performance will be crucial as Inter look to challenge for the title this season.