The Pirates made official their contract with left-hander Francisco Liriano late Friday night, ending more than a month of uncertainty.

Liriano joined the Pirates on a one-year contract with a vesting option for 2014 after passing his physical earlier Friday.

Liriano will make $1 million guaranteed in 2013, according to a source, and can make as much as $3.75 million more depending on how much time he spends on the disabled list due to his broken right humerus.

The team has a 2014 option worth $8 million that could also vest at $5 million, $6 million or $8 million, also based on time spent on the DL in 2013 due to the arm injury.

If Liriano's 2014 option vests for less than $8 million, he can make up the difference with incentives based on games started in '14.

The Pirates sent right-hander Vin Mazzaro outright to Class AAA Indianapolis to make room for Liriano on the 40-man roster.

Liriano, 29, originally agreed to a two-year, $12.75 million contract in late December, but did not take his physical before he broke his arm.