Kyle Walker in protective boot as Man City fear defender could miss huge chunk of Treble run-in after Atletico injury

MANCHESTER CITY are sweating on Kyle Walker’s ankle injury which could rule him out of a chunk of the club’s Treble charge.

The England defender had tests yesterday and was snapped wearing a protective boot after City’s Champions League battle at Atletico Madrid.

Kyle Walker is set for an extended spell on the sidelinesGetty

Walker limped off in Wednesday’s second leg as his side reached the last four and will miss tomorrow’s FA Cup semi-final with Liverpool.

But he could also be out of key matches in the Premier League and Europe.

City are more hopeful of Kevin De Bruyne’s fitness.

But the Belgian, who was subbed against Atletico with an ankle problem, is not likely to be risked at Wembley.

KDB appeared to be moving freely as Pep Guardiola’s squad left Madrid for London.

 They are today using Millwall’s home The Den to prepare for a second clash with Jurgen Klopp’s men in just six days.

City’s goalless draw in Madrid sealed a 1-0 aggregate win and set up   a semi with Atletico’s rivals Real but Pep said new injuries put his team in “big trouble”.

City have 11 days before the Real first leg but also two Prem matches before that.

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They kept their heads amid disgraceful scenes at Atletico.

Raheem Sterling was headbutted by Stefan Savic, who also pulled Jack Grealish’s hair during a 20-man brawl.

Police stepped in as ex-City ace Savic chased Grealish into the tunnel.

Sime Vrsaljko also appeared to spit at Walker and City boss Guardiola was showered in beer by Atletico yobs.

Uefa will investigate the events — and Savic has blown his chance of a last-minute invitation to the club’s 2011-12 title reunion next month.