Willian, who can operate as an attacking midfielder or as a winger, has announced his departure from Chelsea on Twitter.
Sky Sports have claimed that the Brazil international will now sign a three-year contract with Arsenal, having turned down a two-year deal offered by the Blues.
Former Chelsea defender Sinclair has sent a message to Willian on Twitter, and has praised the 32-year-old for his time at Chelsea.
Brilliant signing for Arsenal?
Willian is one of the best attacking players in the Premier League, and Arsenal are reportedly about to make a stunning signing indeed.
Arsenal fans will know all about the Brazilian, having watched him star in the Premier League over the years.
Sinclair’s tweet to Willian underlines just how good a player he is, and what he is capable of.
Although the Brazilian is 32 years of age, he is at the top of his game and will make the Arsenal attacking unit even better.