None of the pros we track run the 4-3-3 in EA FC 27 right now. Here's what they play instead.
Anders Vejrgang, Brice, BroomeyJC, EmreYilmaz, Er_Caccia, Harry, Huge Gorilla, Jafonso, LA4AWALE, ManuBachoore, Mark11, Marley, MoAuba, NickRTFM, Nicolas99FC, Ofek Biton, Ollelito, Roee Feldman, Shawrey, Stokes, Tekkz
AuzioMF, BorasLegend, Danipitbull, Krasi, Levi de Weerd, Nassada, Ovvy, Yaskow
Blachu, InceptionFC, MattHDGamer, Obrun2002
Chousita, Tuga810
AA9skillz
Fuji
Paulo Neto