Firmino missed the Reds’ 1-1 draw with Crystal Palace at Anfield on Monday as a precautionary measure but was back in full training earlier this week.
Of the Brazilian, Jurgen Klopp said: “Bobby trains completely normal and is ready.”
Gomez, meanwhile, is ready for a start having only been deemed fit enough for a second-half cameo last time out.
His manager added: “He was really unlucky, last week he had a little thing, he is back in completely normal training and hopefully stays like this and he will start.”
However, there is no further good news on the injury front for Liverpool ahead of their trip to Old Trafford early next week.
Alex Oxlade-Chamberlain, Thiago Alcantara (both hamstring), Ibrahima Konate (knee) remain out for the foreseeable future.
And, while issues for Caomhin Kelleher, Calvin Ramsay (unspecified injuries) and Joel Matip (groin) are thought to be less serious, they will stay on the sidelines in the short term.
There is, though, better news on Curtis Jones (calf) and Diogo Jota (thigh), who could be ready to return to training after Monday’s game.
Klopp explained: “[Jones and Jota are] getting closer but no chance [for Old Trafford], ask after the game again.”