The latest refereeing assignments have been announced for the upcoming week of Major League Soccer action.

FRIDAY, SEPTEMBER 19

Real Salt Lake vs. Colorado Rapids 
Rio Tinto Stadium (10 pm ET)
REFEREE: RICARDO SALAZAR
AR1: Corey Rockwell
AR2: Ian Anderson
4TH: Juan Guzman

SATURDAY, SEPTEMBER 20

Portland Timbers vs. Vancouver Whitecaps 
Providence Park (5 pm ET) 
REFEREE: HILARIO GRAJEDA
AR1: Peter Balciunas
AR2: Felisha Mariscal 
4TH: Juan Guzman

Philadelphia Union vs. Houston Dynamo 
PPL Park (7 pm ET)
REFEREE: GEOFF GAMBLE
AR1: Daniel Belleau
AR2: Danny Thornberry
4TH: Chris Penso 

Montreal Impact vs. San Jose Earthquakes 
Stade Saputo (7:30 pm ET)
REFEREE: DANIEL FITZGERALD
AR1: Gregory Barkey
AR2: Craig Lowry
4TH: Jorge Gonzalez

New York Red Bulls vs. Seattle Sounders
Red Bull Arena (7:30 pm ET)
REFEREE: ALAN KELLY 
AR1: Paul Scott
AR2: Chris Strickland 
4TH: Robert Sibiga

Columbus Crew vs. New England Revolution 
Crew Stadium (7:30 pm ET)
REFEREE: TED UNKEL
AR1: Jeffery Muschik
AR2: Kyle Longville
4TH: Sorin Stoica 

Chicago Fire vs. D.C. United
Toyota Park (8:30 pm ET)
REFEREE: FOTIS BAZAKOS
AR1: Fabio Tovar
AR2: Gianni Facchini
4TH: Armando Villarreal

Los Angeles Galaxy vs. FC Dallas 
StubHub Center (10:30 pm ET)
REFEREE: KEVIN STOTT
AR1: Jeremy Hanson
AR2: Eduardo Mariscal 
4TH: Alejandro Mariscal

SUNDAY, SEPTEMBER 21

Toronto FC vs. Chivas USA
BMO Field (3 pm ET)
REFEREE: EDVIN JURISEVIC
AR1: Adam Garner
AR2: Mark Cahen 
4TH: Jorge Gonzalez