CHICAGO -- St. Louis left fielder Matt Holliday has a broken right thumb and will be put on the 15-day disabled list after getting hit by a pitch in the Cardinals' 4-3, 11-inning loss to the Cubs.

Reliever Mike Montgomery plunked the seven-time All-Star with a 94 mph fastball on a 1-1 count with two outs and nobody on in the 10th on Thursday night.

The Cardinals said they don't yet know the extent of the injury. Holliday will meet with a hand specialist Friday morning in Chicago and then return to St. Louis.

Holliday immediately grabbed his right hand. He walked to first base accompanied by the trainer before leaving the field.

Holliday said he had a pretty good idea soon after he was hit that his thumb was broken. X-rays showed the fracture. He said it's too early to predict whether the injury will end his season.

"I don't know anything other than that it's fractured, but I doubt it," he said.

St. Louis is 13 games behind the Cubs in the National League Central, but the Cards are in the wild-card hunt.

Montgomery said "it wasn't on purpose" and he was just trying to pitch inside.

Holliday, 36, is in the final season of a seven-year, $120 million contract. The team holds a $17 million option on him for 2017. He is batting .242 with a .768 OPS. He and Brandon Moss are tied for the team lead with 19 home runs.

Holliday has batted third in 85 of the Cardinals' 115 games this season. In his absence, players such as Randal Grichuk and Tommy Pham figure to get more playing time.

"It's super disappointing, but it's part of the sport, unfortunately," Holliday said.

Information from ESPN's Mark Saxon and The Associated Press was used in this report.