Orioles manager Brandon Hyde said Mateo is going through the concussion protocol after exiting Sunday's game versus the Rays, Jake Rill of MLB.com reports.

Mateo was struck in the head by the bat of teammate Cedric Mullins around the on-deck circle and was subsequently removed from the contest. It remains to be seen if Mateo will miss additional time, and he should be considered day-to-day as he continues to be evaluated.

Mateo was removed from Sunday's game against the Rays with an apparent head injury, Melanie Newman of MASN reports.

The 28-year-old appeared to be struck in the head by a bat around the on-deck circle during the fourth inning and was replaced by a pinch hitter shortly thereafter. He singled in his lone plate appearance before exiting the contest. The specifics of the injury are unclear, but Mateo is likely being evaluated for a concussion.

Loftin will start at second base and bat sixth in Sunday's game against the Padres.

Loftin was excluded from the lineup in the Royals' first two games following his call-up from Triple-A Omaha last Sunday, but he's now getting his fifth start in six games Sunday. Four of those starts have come at second base, and he looks like he could be the preferred option at the position over Adam Frazier until Michael Massey (back) returns from the injured list.

Gimenez is out of the lineup for Sunday's game against the Nationals.

Gimenez took a seat Saturday against southpaw Mitchell Parker, but the lefty-hitting infielder will remain on the bench for the series finale versus the Nationals even while a right-hander (Jake Irvin) takes the bump for Washington. The Guardians may have just been looking to get an extended break for Gimenez, who had started in every game dating back to May 10 before his back-to-back absences. Daniel Schneemann was called up from Triple-A Columbus earlier Sunday and will pick up his first MLB start in place of Gimenez at the keystone.

Lowe is out of the lineup for Sunday's game against the Orioles, Marc Topkin of the Tampa Bay Times reports.

Lowe will hit the bench along with fellow left-handed hitters Jonathan Aranda, Ben Rortvedt and Richie Palacios as the Rays roll with a full right-handed-hitting lineup versus Orioles southpaw Cole Irvin. Amed Rosario will fill in for Lowe at second base.

Altuve is out of the lineup for Sunday's game against the Twins.

Altuve is on the bench for just the second time all season and the first time since May 12 in what looks to be nothing more than a routine maintenance day. Mauricio Dubon will step in at second base for Altuve, who is currently in the midst of a seven-game hitting streak.

Farmer is out of the lineup for Sunday's game against the Astros.

Farmer started at second base in Saturday's 5-2 loss, but he'll be back on the bench for the series finale. While Minnesota is at full strength in the infield save for Royce Lewis (quadricep), Farmer will likely be relegated to a short-side platoon role at second base with the lefty-hitting Edouard Julien, who is back in the lineup Sunday.

The Red Sox placed Grissom (hamstring) on the 10-day injured list Sunday.

Though the right hamstring strain that forced Grissom out of Saturday's 6-3 win over the Tigers is considered mild, he'll still need at least a week and a half to make a full recovery from the injury before rejoining Boston's 26-man active roster. The Red Sox selected the contract of Jamie Westbrook from Triple-A Worcester to bolster the team's depth in the middle infield in the short term, but Enmanuel Valdez and David Hamilton may be more likely options to pick up starts at second base while Grissom is on the mend.

Valdez went 3-for-4 with a double, two home runs, three runs scored and three RBI in Saturday's 6-3 win over the Tigers.

Getting the start at DH and batting fifth, Valdez tormented Matt Olson and took him deep in the second and sixth innings, adding a two-bagger in between for good measure. It was the 25-year-old infielder's first start since being called back up from Triple-A Worcester on Wednesday, but with Vaughn Grissom (hamstring) headed back to the IL after leaving Saturday's game early, the path is clear for Valdez to see regular action at second base for at least the next couple weeks, perhaps on the strong side of a platoon with Romy Gonzalez. Valdez is batting just .179 (17-for-95) in the majors this year, but he's having a breakout season in the power department, slugging four homers in 31 games for Boston and adding six in 20 games for Worcester.

Grissom has a mild right hamstring strain and is expected to be placed on the injured list, Gabrielle Starr of the Boston Herald reported Saturday.

Grissom was removed from Saturday's game against the Tigers in the third inning after slowing up and grabbing his right hamstring running to first on a groundout. While it's not the same hamstring that sidelined him at the start of the year, Saturday's injury will likely require an IL stint. While Grissom is sidelined, expect Romy Gonzalez, David Hamilton and Ceddanne Rafaela to see plenty of work in the middle infield.