Fulham boss Slavisa Jokanovic conceded their 5-1 home thrashing by Arsenal was a heavy defeat.
The Gunners were never tested by the Cottagers.
Jokanovic said, "It is without any doubt a hard defeat for us, we tried to create things but showed many weaknesses as they scored easy goals.
"We tried to be offensive and play high with two full-backs to find a solution, but from the second goal it is clear the plan was not working. We really need to work on the weaknesses in the defensive side.
"It has to be a worry always [when you are conceding lots of goals]. It is a hard result, but today Arsenal showed their quality and pace. We have 90 [possible] points ahead of us and we need to be brave and keep on fighting."