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."
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THE BIGGER PICTURE
Walker, having struggled for form this season at the same time as dealing with problems in his personal life, will finish the season at Milan, where he will wear the number 32 shirt in honour of David Beckham. But the deal includes an option to make it a permanent transfer in the summer, with Walker seemingly hoping it will represent a new chapter beyond just the football.
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WHAT NEXT?
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.