Liverpool defender Conor Bradley is fully focused on his rehabilitation after undergoing surgery on a season-ending knee injury.The Northern Ireland international, 22, was carried off in the closing stages of the Reds goalless draw at Premier League leaders Arsenal last Thursday.He faces a race to recover in time for this summers World Cup, should his country qualify through the play-offs.Bradley took to Instagram to update fans on his progress.TRENDINGStoriesVideosYour SayHe wrote: "A big blow but surgery is done so the comeback starts now."It wont be for a little while but I already cant wait to get back playing for Liverpool and Northern Ireland. "Thanks for all the support."The right-back, who has 30 caps for Northern Ireland, has made 21 Liverpool appearances this season, having missed a number of matches with a hamstring problem.Arsenal forward Gabriel Martinelli found himself at the centre of a heated controversy during the closing stages of the goalless encounter with Liverpool at the Emirates Stadium.He apologised for throwing the ball at Bradley and then attempting to push him off the pitch as he lay injured on the turf.The Brazilian winger attempted to shove the stricken Conor Bradley over the touchline after the Liverpool defender suffered what appeared to be a twisted knee whilst putting the ball out for a throw-in.Bradley was left in considerable pain near the sideline when Martinelli made his ill-judged intervention, prompting an angry response from the visiting players.LATEST SPORT NEWSMichael Carrick speaks out for the first time after Manchester United appointmentPep Guardiola launches furious rant over controversial decision during Man Citys win at NewcastleEddie Howe demands more 'magical moments' as Newcastle aim to defend cup following Man City setbackThe ensuing confrontation saw both Martinelli and Liverpool's Ibrahima Konate receive yellow cards, with the French defender having forcefully pushed the Arsenal man as referee Anthony Taylor intervened.The incident drew fierce criticism from Sky Sports pundit Roy Keane, who drew upon his own playing experience when condemning the Arsenal man's actions."I didn't like it at all. It happened to me once. I was badly injured and a player stood over me. It's not good," the former Manchester United captain remarked.Keane went further in his assessment of the Brazilian's conduct, he said: "Throwing the ball at him, standing over him and getting a little knee on him. He tries to force him off. That behaviour is an absolute disgrace." View this post on Instagram A post shared by Conor Bradley (@conorbradley.03)Liverpool have confirmed Conor Bradley will be sidelined for the rest of the season after sustaining a serious knee injury requiring surgical intervention.The 22-year-old right-back suffered damage to both bone and ligament during Thursday evening's Premier League encounter at Arsenal, though scans have ruled out any tear to his anterior cruciate ligament.Surgery is scheduled for the coming days, after which the Northern Ireland international will commence his rehabilitation programme at the club's AXA Training Centre.The Reds have declined to specify a recovery timeline at this stage.Our Standards: The GB News Editorial Charter