Jaguars general manager David Caldwell confirmed Monday that Thomas, the team's top free agent acquisition this past offseason, will receive a second medical opinion Tuesday before deciding whether to undergo the surgery.
A source told ESPN NFL Insider Adam Schefter that Thomas is expected to undergo the surgery.
Thomas was injured in Jacksonville's preseason opener earlier this month, but the Jaguars expected him to be ready for their regular-season opener.
ESPN Jaguars reporter Mike DiRocco contributed to this report.
Julius Thomas could miss a month
ESPN Jaguars reporter Michael DiRocco discusses the injury to tight end Julius Thomas' finger, which is expected to require surgery, and how his absence from the lineup will hurt the team.