Victor Martinez explains why he believes he will retire at the end of the year and that he is just trying to enjoy the ride until then. (0:48)

Victor Martinez says he's 'pretty sure' he will retire (0:48)

Detroit Tigers designated hitter Victor Martinez said after Wednesday's 6-5 home loss to the Chicago White Sox that this season will likely be his last.

"I'm pretty sure this is going to be it," said Martinez, who will be 40 in December. "Like I said, I'm just enjoying these last six weeks and finally go home."

Martinez, who singled as a pinch hitter Wednesday, is batting .244 this season with six home runs and 39 RBIs.

He said that despite a disappointing season for the 50-71 Tigers, he still feels fortunate to play the game.

"I tell the guys you have to enjoy it," Martinez said. "We're lucky to be here just in this [locker] room. You have to enjoy every moment because you never know where you're gonna be tomorrow."

He has a .295 career batting average with 243 homers and 1,163 RBIs in 1,945 games with the Indians, Red Sox and Tigers.

Martinez, who spent the bulk of his career as a catcher, is in the final season of a four-year, $68 million contract.