Wladimir Klitschko posts video of himself back sparring at age 45, prompting fans to speculate about rematches with Tyson Fury and Anthony Joshua

Wladimir Klitschko has returned to the boxing gym and started sparring again.

The 45-year-old former heavyweight champion retired back in 2017, following back-to-back defeats to Tyson Fury and Anthony Joshua.

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He has since rarely shown images of himself back in the ring.

Not long after quitting the sport, Klitschko posted pictures showing that he'd sparred with then cruiserweight champion Oleksandr Usyk.

He helped his fellow Ukrainian prepare for his move to heavyweight.

This proved successful as Usyk has now dethroned Joshua and taken the belts Klitschko himself used to hold.

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Now though, Wladimir has posted footage showing himself back sparring once more.

This has prompted speculation that he could finally make a comeback in 2022.

Some fans have even began talking about the possibilities of rematches with Fury and AJ.

Speaking initially after his retirement, Klitschko said that the only way he'd ever likely be tempted back to boxing would be if the opportunity arose to break George Foreman's record as the oldest heavyweight champion in history.

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Foreman was 45 years and 299 days old when he beat Michael Moorer to win the WBA and IBF belts in 1994. This win also made him the 'lineal' champion.

His last successful defence of the IBF belt came at age 46 years and 102 days, while he finally lost the 'lineal' crown to Shannon Briggs at age 48 years and 316 days.

It's unclear which of these feats Klitschko could be intending to surpass, but he is now 45 years and 265 days old.

Hypothetically, should the Ukrainian great return to the sport, he is approaching the right timeframe to try and break these records.