Grealish posted a number of pictures of the pair together over the last few years, making clear his feeling for his team-mate and friend, who is already tipped to stay permanently at Milan next season.
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WHAT JACK GREALISH SAID
Grealish captioned his post: "What an absolute LEGEND! I wish you all the best on your next chapter skip!! Been a pleasure to play with you these last 4 years! My brother for life."
While Walker waits for an Italian work permit, life at Manchester City goes on. After a dramatic Champions league defeat to Paris Saint-Germain in midweek, having been 2-0 up in the second half, Pep Guardiola's side host Chelsea in the Premier League on Saturday evening. City have won three of their last four league games to end a blip that set in in November, but it will be a tough test following the nature of the PSG setback.