Cristiano Ronaldo has been Manchester Uniteds heartbeat, according to Usain Bolt, who says he understands the strikers recent criticism of the club.Ronaldo has come under fire David Justice Jersey this week after conducting an explosive interview with Piers Morgan, in which he said he felt betrayed by United and had no respect for head coach Erik ten Hag.While Ronaldo is preparing to appear at his fifth World Cup with Portugal, United have committed to taking appropriate steps against him.Former United defender Gary Neville Scott Kazmir Jersey is among those to have urged the club to terminate Ronaldos contract, but eight-time Olympic gold medallist Bolt a keen Red Devils supporter would be sad to see him go.Questioned by Sky Sports regarding the five-time Ballon dOr winners future on Sunday, R.A. Dickey Jersey Bolt said: Yeah, Im sad to see him go, you know what I mean?Its Cristiano Ronaldo, hes been, as far as I can say, Manchester Uniteds heartbeat. Hes done so well for the club.For me, its going to be stre sful to see him Bob Uecker Jersey go, but I understand what hes saying. I watched the interview, so I know whats going on.Ronaldo top-scored for United with 24 goals in all competitions Brandon McCarthy Jersey last season, but he has played a limited role since Ten Hag took charge ahead of the new campaign.The 37-year-old has started just four Premier League games for United this term, hitting the net once, in a 2-1 victory at Everton last month.