Mayer (back) has started baseball activities, Jen McCaffrey of The Athletic reports.

Mayer has shifted his rehab program to the Red Sox's facility in Florida and is not expected to return from Triple-A Worcester's 7-day injured list before the end of the season while he recovers from a lumbar strain, Alex Speier of The Boston Globe reports.

Mayer (hip) will be placed on the 7-day injured list at Triple-A Worcester, Alex Speier of The Boston Globe reports.

Mayer hasn't played since July 30 due to a hip issue but he is considered day-to-day, Katie Morrison-O'Day of MassLive.com reports.

Mayer was promoted to Triple-A Worcester on Sunday, Alex Speier of The Boston Globe reports.

Mayer was placed on the 7-day injured list at Double-A Portland on Thursday with a hip injury, SoxProspects.com reports.

Red Sox director of player development said the organization is looking for Mayer to develop an increased walk rate, a narrowed strike zone and to see more left-handed pitching, Jen McCaffrey of The Athletic reports.

Mayer (back) is starting at shortstop and batting second in Friday's game for Double-A New Hampshire, Alex Speier of The Boston Globe reports.

Mayer (lower leg) returned to the Double-A Portland lineup Thursday and has started in each of the club's last three games, going 4-for-14 with two doubles, a walk, an RBI and a run.

Mayer won't start for Double-A Portland in Wednesday's game against Reading due to minor left lower leg soreness, Christopher Smith of MassLive.com reports.