Fekir has been the subject of heavy speculation all summer linking him with a move away from Ligue 1.
The Lyon attacking midfielder came within a whisker of joining Liverpool before the World Cup and the Reds have continued to be linked with Fekir.
Firmino and youngster Trent Alexander-Arnold are expected to play a part in Liverpool's penultimate pre-season friendly against Napoli in Dublin.
Day and Leishman high on WGC leaderboard
The 22-year-old was one of three rookies and 24 first-timers, including seven making their WGC debuts. Thomas shot 15-under for the tournament, beating second-place finisher Kyle Stanley by four shots.
"But I've no doubt he is a good enough player to deal with that", he added.
Liverpool, who have spent upwards of £175m this summer, are also still interested and Jurgen Klopp has hinted that his side will make one last signing before the new season gets underway. I still remember the Burnley game [at Turf Moor in August 2016] when we lost 2-0 with 80 per cent possession.
In an interview with Liverpool FC, Andy Robertson spoke as to how this will help out the squad: "It's also good for us to get used to our surroundings again", said the defender. I feel great in the group. "He probably won't play Tuesday and Sunday will be very hard as well", continued the German, who is known to stick to a very rigorous training strategy.