A wrist injury cost Matt Wallner some valuable time this season. The former Southern Miss star will get to make up some of the missed at-bats in the Arizona Fall League, which starts Oct. 13. Wallner, Minnesota’s 14th-rated prospect by mlb.com, is one of five Mississippi products bound for the AFL, a sort of select league for top minor leaguers. Grae Kessinger, Justin Foscue, James McArthur and Joe Gray Jr. also merited AFL assignments from their respective organizations, as did Shea Langeliers and several other Mississippi Braves alumni. Wallner, a lefty-hitting outfielder, hit .265 with 15 homers and 47 RBIs in 66 games in High-A ball in the Twins’ system; he’ll play for Scottsdale. Ole Miss alum Kessinger, an infielder, batted .209 with nine homers, 26 RBIs and 12 steals in Double-A for Houston. The Astros’ No. 23 prospect will play for Glendale. Ex-Mississippi State standout Foscue, another infielder, batted .275 with 17 homers and 51 RBIs in three levels of Texas’ system. The 2020 draftee is rated the Rangers’ No. 4 prospect; he’s bound for Surprise. McArthur, a right-hander out of Ole Miss, went 2-6 with a 4.48 ERA for Philadelphia’s Double-A club. A 2018 draftee, he’ll pitch for Peoria. Gray, an outfielder from Hattiesburg High, hit .252 with 20 homers, 90 RBIs and 23 steals in A-ball in a long-awaited breakout season in Milwaukee’s chain. The Brewers’ No. 9 prospect is assigned to Salt River. … Langeliers, Atlanta’s No. 2 prospect, hit 22 homers and was a stalwart behind the plate for the Double-A South champion M-Braves. He’s on Peoria’s roster.