Rob Bradford of WEEI.com was told by one source that Clay Buchholz may be dealing with a physical issue.
Conor Gillaspie (foot) will start the second half of Thursday's doubleheader against the Orioles.
White Sox manager Robin Ventura said David Robertson probably won't pitch in Thursday's doubleheader.
White Sox manager Robin Ventura confirmed that Avisail Garcia (knee) won't play in either half of Thursday's doubleheader at Baltimore's Camden Yards.
Grant Balfour is said to be leaning toward retirement.
Matt Adams will undergo surgery Friday to repair a torn right quadriceps muscle.
Tuffy Gosewisch will have an MRI taken of his left knee Thursday.
Max Scherzer pitched seven shutout innings and struck out 13 as the Nationals beat the Cubs 3-0 on Wednesday.
Chris Davis hit two homers, including the game-winning blast, to propel the Orioles past the Astros 5-4 on Wednesday.
Scott Kazmir will have an MRI of his left shoulder taken Thursday.
Yoenis Cespedes finished 2-for-3 with a home run and three RBI in the Tigers' 3-2 defeat of the A's on Wednesday afternoon at Oakland's O.co Coliseum.
Cardinals manager Mike Matheny said Wednesday that Matt Adams could need surgery on his right quad.