McClanahan (forearm) will not return before the conclusion of the regular season, Marc Topkin of the Tampa Bay Times reports.
Jax (8-10) earned the win against the Red Sox on Sunday, allowing three hits and two walks while striking out five over five scoreless innings.
Simpson went 1-for-3 with two RBI and a stolen base in Sunday's 5-1 win over the Red Sox.
O'Brien threw a clean ninth inning to earn the save Sunday against the Nationals.
Mathews didn't factor into the decision Sunday against Washington, striking out three while allowing three runs on seven hits and two walks in seven innings.
Herrera went 2-for-4 with two solo home runs Sunday in a 5-3 win over Washington.
Gorman is out of the lineup for Sunday's game against the Nationals.
Hence recently underwent surgery on his right arm, Redbird Farmhands reports.
Winn is absent from the lineup for Sunday's matchup against Washington.
Tampa Bay designated Fraley for assignment Sunday.
