"Trying to keep [the bullpen] intact and healthy, like we've been fortunate enough to do all season," said manager Buck Showalter, who takes special care in preserving the relief corps, which has been the team's greatest strength this season.
Eveland found out at about 1 a.m. and drove with coordinator of Minor League instruction Brian Graham from Lehigh Valley to arrive in Baltimore on Thursday morning.
He made one start for Norfolk since being outrighted for the second time this season, a 3 1/3-inning start in which he gave up six runs. In 14 Major League games, Eveland is 0-1 with a 4.73 ERA, making two spot starts.
Infielder/outfielder Steve Tolleson was optioned to Norfolk to clear a spot on the 25-man roster.
Tolleson batted .194/.242/.339 with two home runs and six RBIs in 23 games for the Orioles over three stints this season. The Orioles had an opening on their 40-man roster after designating Steve Pearce for assignment.