Willian was absent from the Arsenal squad last weekend as they suffered a disappointing 1-0 defeat to Leicester at the Emirates.
However, Gunners boss Mikel Arteta is hopeful Willian's 30-minute cameo against Dundalk will aid his fitness.
The 32-year-old is now likely to be in contention for Sunday's trip to Manchester United where Arteta could deploy him again as a false nine as he did against Manchester City earlier this month.
“We missed Willian the last couple of weeks, he had a very short pre-season,” Arteta said after the win over Dundalk.
“He needs that bit of rhythm. He looked good today, great to get some minutes in his legs.”
Arteta's comments come after the Brazilian admitted to sometimes getting frustrated with the rigid structure and style implemented by the Arsenal manager.
“It’s been a cool, new experience. I hadn’t worked with a coach with that mindset,” Willian told Globo Esporte.
“The positional game doesn’t mean that you have no freedom on the pitch, you have the freedom to move, but many times you have to respect the position, what the coach asks, the instructions, understanding that it’ll be better for the team.
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“It may happen that you don’t touch the ball and get frustrated, but Mikel always says that, wait a minute, the ball will arrive. I've been learning a lot.”
This article was most recently revised and updated 3 years ago