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LSU head coach Paul Mainieri in the dugout before game two of the NCAA Baton Rouge Regional between LSU and Stony Brook, Friday, May 31, 2019, at LSU's Alex Box Stadium in Baton Rouge, La.

Paul Mainieri dropped into his office chair.

Not even a week past LSU's elimination at the hands of College World Series-bound Florida State in the Baton Rouge super regional, the Tigers baseball coach has been conducting exit interviews with his assistant coaches and players, closing out the 2019 season.

"I wish I was in Omaha," said Mainieri to begin his final news conference of the season.

So did the rest of his coaching staff, which Mainieri said he didn't anticipate changing this offseason.

There'll be plenty of turnover on the roster: Mainieri said freshman right-handed pitcher Riggs Threadgill will transfer, joining sophomore catcher Brock Mathis and freshman right-hander Will Ripoll, who both announced their intention to transfer earlier this week.

The 6-foot-4, 225-pound Threadgill, a Texas native, pitched 13 2/3 innings in 2019 with a 7.24 ERA.

Mainieri also expects pitchers Zack Hess (Detroit Tigers, seventh round) and Todd Peterson (Washington Nationals, seventh round) to sign with the MLB clubs that selected them in the draft last week.

They'll join their teammates who already have signed: second baseman Josh Smith (New York Yankees, second round), center fielder Zach Watson (Baltimore Orioles, third round) and right fielder Antoine Duplantis (New York Mets, 12th round), who finished his senior year as LSU's all-time hits leader.

Mainieri said he expects catcher Saul Garza, who was selected in the 32nd round by the Kansas City Royals, to return for his junior year, when he'll have a chance to build on the hot postseason he had at the plate to close out the 2019 season batting .303 with five home runs and 27 RBIs.

Garza's one of the few sure things returning.

In addition to those leaving in the draft, second baseman Brandt Broussard and Chris Reid, who played first and third, have expired their eligibility.

Out of the five infielders remaining on the roster, freshmen Cade Beloso (.279 batting average) and CJ Willis (.212) were the only players who hit over .200 during the 2019 season.

Infielders Drew Bianco (.176 batting average), Gavin Dugas (.186) and Hal Hughes (.174) all struggled at the plate in 2019.

Beloso played the most at first base in 2019 (44 games), but Mainieri isn't certain what LSU's infield will look like in 2020. The 13-year coach said he expects Willis to play either first base or left field, but his positions "are a bit limited" after he tore his labrum last fall, an injury that generally diminishes arm strength.

Willis could move to the outfield, part of Mainieri's plan to move Daniel Cabrera from left field to right field.

"He's got a strong arm," Mainieri said of Cabrera, who batted .284 with 12 home runs and 50 RBIs. "I think he did a really good job in left field this year. I think he's he's really improved his defense."

The rest of the infield is wide open; Mainieri said he and assistant coach Nolan Cain have been "scouring the country" looking for infield recruits to join the team.

LSU will have to reload its recruiting class, since Mainieri expects to lose shortstop Rece Hinds (Cincinnati Reds, second round) and second baseman Christian Cairo (Cleveland Indians, fourth round) to the MLB clubs that drafted them.

And then there's the LSU pitching staff, that injury-riddled position group that seemed plagued throughout the season.

Mainieri is doling out a summer of rest to most of the pitchers.

Cole Henry, who missed several games with elbow discomfort and nerve issues, and Jaden Hill, who missed most of the season with elbow discomfort, will not be throwing at all during the summer, nor will Devin Fontenot, Landon Marceaux and Eric Walker.

Hill (1-0, 1.80 ERA in two games) underwent surgery May 30 to remove a screw from a plate in his collarbone, an injury he sustained playing high school football.

Mainieri said "there's no rush" to get Hill back, and he hoped the 6-foot-4, 217-pound sophomore will be ready for fall practice, but he doesn't know exactly when Hill will begin to throw again this summer.

"How his body feels will tell us when that day will be," Mainieri said. "I hope that he's going to be ready for fall intra-squad scrimmages, but I can't say that with 100 percent certainty."