Keith Downing's team will face Croatia in Zagreb next Friday before taking on Bulgaria at Wycombe Wanderers' Adams Park on Monday, October 10.
And Alexander-Arnold will hope to feature in both fixtures after being included in the Young Lions' 23-man selection for that double-header.
The versatile Scouser was part of the Reds first team's pre-season tour of the United States in the summer, and has shown impressive form for the club's U23s during the start to the 2016-17 campaign.