Liriano's agreed-to contract with the Pirates is in jeopardy after the pitcher injured his right arm sometime around Christmas, the Pittsburgh Tribune-Review reported.
According to the report, Pirates general manager Neal Huntington confirmed the injury Tuesday. However, Huntington didn't disclose how Liriano -- a left-handed pitcher -- got hurt or whether the injury would prevent him from being ready for the start of spring training on Feb. 12.
"We continue to have dialogue with Francisco's [agent], but there is nothing to announce at this time," Huntington told the newspaper.
On Dec. 21, Liriano agreed to a two-year deal worth between $12 million and $14 million, according to reports, but he's yet to sign it.
The Pirates are hoping Liriano can help them at least reach .500. Their record string of losing seasons was extended to 20 in 2012 when they went from 16 games over .500 on Aug. 8 to a 79-83 finish, losing 35 of their last 50 games.
Liriano, who underwent elbow-reconstruction surgery that cost him the entire 2007 season, has a career record of 53-54 with a 4.40 ERA in 168 games. His high point was a no-hitter while with the Twins in May 2011.
Information from The Associated Press was used in this report.