The former Chelsea man confirmed on Sunday that he would be departing Stamford Bridge after a seven-year spell at the club, where he amassed 63 goals from 339 appearances across all competitions.
Willian has since been heavily linked with a move across the capital to Arsenal, and the Brazilian's move to the Emirates appears to be inching closer ahead of the 2020-21 campaign.
According to the Evening Standard, Willian has now undergone his medical with the Gunners and is poised to put pen to paper on a three-year deal with Arsenal.
The signing of Willian would be Mikel Arteta's first acquisition of the summer, with the Spaniard supposedly keen to undertake a significant overhaul of his squad before his first full season in the Emirates dugout.
Willian's move to Arsenal will supposedly be completed by the end of the week.