Selsky spent most of 2016 at Triple-A Louisville, starting 39 games in the outfield, 33 at first base and eight at DH while hitting .280 with an .822 OPS, 24 doubles and nine homers. He was a 33rd-round selection by the Reds in the 2011 Draft, and he has a .295 average and a .379 on-base percentage in 537 Minor League games.
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The Red Sox have Mitch Moreland slated as the starting first baseman, and an outfield of Andrew Benintendi, Jackie Bradley Jr. and Mookie Betts, with Chris Young serving as a reserve. Hanley Ramirez will be the primary designated hitter while also playing some first base.
An injury would likely have to occur for Selsky to make the Opening Day roster. With the transaction, the Red Sox's 40-man roster is now at 40.
Ian Browne has covered the Red Sox for MLB.com since 2002. Follow him on Twitter @IanMBrowne and Facebook. This story was not subject to the approval of Major League Baseball or its clubs.