Vitali Klitschko hopes to one day avenge his brother Wladimir's defeat by Anthony Joshua, claiming even at 46 he could knock Britain's unified heavyweight world champion out. Joshua climbed off the canvas to stop Klitschko in the 11th round of their April Wembley blockbuster to send the 41-year-old into retirement. Vitali worked his brother's corner that night and advised him against pushing for a knockout after he had floored Joshua in round six. +5 Vitali Klitschko wants the chance to avenge his brother Wladimir's defeat by Anthony Joshua +5 Vitali advised his brother against pushing too hard for a knockout after he floored Joshua +5 The 46-year-old said: 'If I didn't tell him to stop, then Wladimir might have knocked him out' But after 'AJ' found a second wind and won the fight, the elder Klitschko - a former WBO and WBC heavyweight king - wants the chance to make up for his own misjudgement. 'I feel a bit guilty, because I told Wladimir in the corner please don't be so active in round number six when Wladimir sent Joshua to the floor,' he told FightHubTV. 'I didn't expect such a big-muscled athlete to recover. I was surprised, Joshua recovered so fast and stopped Wladimir. If I didn't tell him to stop, then Wladimir might have knocked him out, six or maybe round number seven,' he added 'A fight against Joshua is my best wish. I have a feeling I can do it better, I have to fight Joshua and bring back the belt to the family.' +5 Vitali stopped Corrie Sanders in 2004, a year after the South African had beaten Wladimir Between them, the two Klitschko brothers ruled the heavyweight division for several years Vitali has not fought since beating Manuel Charr in 2012 and now works as the Mayor of Kiev in his native Ukraine. Despite training twice a week and missing boxing 'very much', the 46-year-old accepts that his current responsibilities make a return to the ring impossible. But Vitali stopped Corrie Sanders in 2004, a year after the South African had beaten Wladimir. And the Ukrainian believes he could the same to Joshua, who he feels has much left to prove before he can be crowned the best heavyweight on the planet. 'In the position I have right now, I don't have the chance to come back to fight Joshua but I feel like if I went inside the ring, I'd knock him out,' he said. 'Wladimir was, for a long time, the best heavyweight in the world. Joshua stopped him and who stopped the best automatically is the best. But was it just a lucky night for Joshua? He can prove himself in the next couple of fights.'