I expect we will remain at 4-5-1 given that Brentford are strong at home and play the type of football they play. I would make a couple of changes though subject to availability. We need a proper defensive option in midfield so Barry or Field should be in the team to do that job. Livermore just doesn't justify a place at all for me so I'd replace him with Johansen and I'd play Brunt on the right hand side, he has the ability to find Gayle or find Rodriguez with diagonal balls. I'm presuming Phillips won't be available, even if he is I'd leave him out and give him time to get over these recurring problems properly:
Johnstone
Holgate Dawson Hegazi Townsend
Barry
Harper Johansen
Brunt Rodriguez
Gayle
Subs: Bond, Mears, Bartley, Field, Livermore, Robson-Kanu, Murphy
There must be doubts regarding the availability of Holgate, Dawson and Barry. If not available replace them with Mears, Bartley and Field.