[MLS INJURY REPORT] The Chicago Fire defender Cory Gibbs will be out 4-6 months after undergoing successful surgery to repair a torn meniscus in his right knee on Tuesday. The former U.S. international suffered the injury last week in training when the Fire was idle. He was its 2011 Defender of the Year and had played every minute this season.

EASTERN CONFERENCE:
CHICAGO FIRE -- OUT: MF Steven Kinney (R posterior tibialis tendinitis); DF Cory Gibbs (R knee meniscus tear); QUESTIONABLE: DF Dan Gargan (L toe sprain)

COLUMBUS CREW -- OUT: FW Ben Speas (sports hernia rehab); DF Rich Balchan (sports hernia rehab); FW Tommy Heinemann (L knee internal injury); DF Julius James (illness); DOUBTFUL: GK William Hesmer (R ankle sprain); QUESTIONABLE: DF Carlos Mendes (R hamstring strain); MF Danny O'Rourke (L ankle sprain)

D.C. UNITED -- OUT: DF Ethan White (R knee surgery); MF Lance Rozeboom (L ACL tear); QUESTIONABLE: GK Bill Hamid (L ankle sprain / bone bruising); MF Kurt Morsink (L foot neurectomy); PROBABLE: FW Josh Wolff (L groin strain)

HOUSTON DYNAMO -- OUT: MF Brad Davis (L calf strain)

SPORTING KC -- OUT: GK Eric Kronberg (lower back injury); PROBABLE: DF Cyprian Hedrick (R Achilles tendinitis)

MONTREAL IMPACT -- OUT: DF Nelson Rivas (L hamstring strain); DF Calum Mallace (R ankle sprain); QUESTIONABLE: MF Sanna Nyassi (R hip flexor)

NEW ENGLAND REVOLUTION -- OUT: FW Zak Boggs (R ankle sprain); MF Sainey Nyassi (R hamstring strain); DOUBTFUL: DF Kevin Alston (L hamstring tightness); MF Benny Feilhaber (L peroneal strain); QUESTIONABLE: GK Matt Reis (L knee swelling); MF Clyde Simms (R calf tightness)

NEW YORK RED BULLS -- OUT: FW Juan Agudelo (L knee surgery recovery); MF Teemu Tainio (R knee sprain); QUESTIONABLE: DF Wilman Conde (groin strain)

PHILADELPHIA UNION -- OUT: FW Krystian Witkowski (concussion); MF Roger Torres (L knee MCL sprain); PROBABLE: DF Danny Califf (L hamstring strain)

TORONTO FC -- OUT: FW Nicholas Lindsay (L knee surgery recovery); DF Dicoy Williams (R knee surgery recovery); DF Jeremy Hall (sports hernia surgery recovery); GK Stefan Frei (L lower leg); QUESTIONABLE: MF Torsten Frings (R hamstring strain); PROBABLE: DF Adrian Cann (R knee surgery recovery)

WESTERN CONFERENCE:
CHIVAS USA -- OUT: MF Marvin Iraheta (L knee ACL); FW Juan Pablo Angel (concussion symptoms); QUESTIONABLE: MF Pete Vagenas (rib contusion); PROBABLE: DF Michael Lahoud (R hamstring strain)

COLORADO -- OUT: MF Jamie Smith (R ACL tear); DF Anthony Wallace (L Achilles tear); MF Pablo Mastroeni (headaches); QUESTIONABLE: FW Conor Casey (L Achilles tear); DF Eddie Ababio (concussion); PROBABLE: MF Ross LaBauex (sports hernia)

FC DALLAS -- OUT:  MF David Ferreira (R ankle); MF Ricardo Villar (R foot); MF Andrew Wiedeman (sports hernia repair); QUESTIONABLE: DF George John (concussion symptoms); FW Scott Sealy (L hamstring)

LA GALAXY -- OUT: DF Omar Gonzalez (L knee surgery); DF Leonardo (R knee surgery); GK Brian Perk (sports hernia surgery); QUESTIONABLE: MF David Beckham (back spasms); MF Michael Stephens (R ankle sprain)

PORTLAND -- OUT: GK Joe Bendik (R knee meniscus surgery); DF Futty Danso (L foot fracture); FW Eddie Johnson (concussion); MF James Marcelin (L hamstring strain); DF Rodney Wallace (L ankle sprain); DOUBTFUL: GK Jake Gleeson (R knee IT band tightness); DF David Horst (R hip surgery); QUESTIONABLE: MF Sal Zizzo (L ACL surgery)

REAL SALT LAKE -- OUT: MF Nico Muniz (R MCL sprain); DOUBTFUL: FW Cody Arnoux (L adductor strain); MF Ned Grabavoy (L rib cage dislocation); MF Enzo Martinez (lower back spasms); MF Javier Morales (R hamstring strain)

SAN JOSE -- OUT: MF Joey Gjertsen (R knee surgery); DF Tim Ward (L non-specific soft tissue injury); DOUBTFUL: FW Alan Gordon (L hamstring strain); FW Steven Lenhart (R hamstring strain); QUESTIONABLE: MF Sercan Guvenisik (R hip flexor strain)

SEATTLE -- OUT: GK Josh Ford (R knee stress fracture); DF Michael Tetteh (L hamstring strain); MF Steve Zakuani (R leg fracture); FW Babayele Sodade (R ACL tear); QUESTIONABLE: DF Adam Johansson (L hamstring strain); MF Mauro Rosales (R knee sprain); PROBABLE: DF Jhon Kennedy Hurtado (pelvic sprain)

VANCOUVER -- OUT: FW Etienne Barbara (groin strain); FW Darren Mattocks (R shoulder burn); DF Alain Rochat (L knee sprain); DOUBTFUL: MF Floyd Franks (lower back pain); QUESTIONABLE: MF Michael Nanchoff (L heel contusion); GK Brian Sylvestre (R knee surgery); PROBABLE: FW Camilo Sanvezzo (R quad strain)