"Obviously, they've got decisions to make. I want to make it easy on them to bring me back. I have to play to my capability."
The Dodgers have always been puzzled by Loney's lack of power, but Mattingly said that never bothered him as long as Loney was averaging 90 RBIs, as he did for three years. But Loney has only 34 RBIs in 108 games this season, batting .251 with 17 extra-base hits.
"I've been a big fan of James, and I thought he'd hit home runs, but I've gotten away from that," said Mattingly, who said Rivera is needed to bat fifth and protect Matt Kemp in the order.
"Last year at the break, he had 25 doubles, six homers, 63 RBIs. Is it that guy? That guy is fine, driving in 100, 110 runs. I don't care if he hits home runs. But since then, he has 50 RBIs in 700 at-bats. Which way is it going? That's a tough call. It depends on what's going on around him. We have Matt and Andre. I still feel we need another thumper. Where is the thumper at? Left field, third base, second base? Looking into the future, there's a missing piece."
Mattingly began his career as a Loney-type line drive hitter, "but all of a sudden I learned to do that [hit home runs]," he said. "I looked at James and thought the power would come, but it hasn't progressed."
Mattingly said he has no problem with Loney's effort, even though Loney's laid-back demeanor doesn't always demonstrate it.
"Everything he's got, he's trying to give us," Mattingly said. "We've talked about this. He plays first base. He knows what's going on. He's trying as hard as anybody we've got."
Said Loney: "Everybody has their own way of dealing with things. You've got to know who you're dealing with. It's not fun. You don't want to let your team down or let yourself down. You just want to do the best you can."