NEW YORK -- The Red Sox will promote first baseman Sam Travis, catcher Blake Swihart, and pitchers Roenis Elias and Austin Maddox on Friday as September call-ups.

MLB teams are allowed to expand their roster beyond 25 players in September.

The Red Sox are expected to promote more players Saturday, Sunday and Monday.

Travis batted .270 with a .351 on-base percentage, .375 slugging percentage, .726 OPS, six homers, 14 doubles and 24 RBIs in 82 games for Triple-A Pawtucket.

He hit left-handed pitching well in two stints with the Red Sox earlier this year. He went 11-for-29 (.379) with four doubles, one RBI and nine runs vs. southpaws. He went 1-for-14 (.071) with a double vs. righties.

Swihart has had an injury-plagued season. He batted just .190 in 53 games for Pawtucket. But it helps to have an extra catcher on the active roster.

Maddox, a righty, has posted a 2.92 ERA and 1.16 WHIP in 37 outings (49 1/3 innings) between Double-A Portland and Pawtucket this year.

He has made three appearances (3 2/3 innings) for Boston, giving up no runs, no walks and four hits while striking out two.

Elias spent significant time on the DL this year with a right intercostal muscle strain. The lefty is 1-4 with a 6.62 ERA in seven starts for Pawtucket.