Russia's official state news agency TASS reported the 24-year-old, a five-time European champion, has undergone surgery and is expected to be out for around three months.

Dalaloyan is facing a race against time to be fit for this year's postponed Tokyo 2020 Olympic Games, where he is among the favourites for all-around gold.

A host of Olympic gold medallists are set to compete at the European Championships in the Swiss city, due to open tomorrow and conclude on Sunday (April 25).

The men's event features Britain's Olympic all-around and pommel horse champion Max Whitlock, 2019 European all-around champion Nikita Nagornyy of Russia and Ireland’s pommel horse star Rhys McClenaghan.

London 2012 Olympic high bar gold medallist Epke Zonderland of The Netherlands and Greece's three-time world champion Eleftherios Petrounias, who won the rings title at Rio 2016, have also entered the Championships.

Melanie de Jesus dos Santos of France will not defend her European all-around crown after deciding to focus on the uneven bars.

Switzerland's 2015 European all-around champion Giulia Steingruber will be among those hoping to capitalise on Dos Santos' absence.

Minsk 2019 European Games gold medallist Angelina Melnikova and her Russian team mate Viktoria Listunova, the 2019 world junior all-around champion, could also be in contention.

Women's qualification is scheduled for tomorrow, before men's qualification takes place on Thursday (April 22).

All-around finals are due to be held on Friday (April 23), with apparatus finals the focus of the final two days of the Championships.

The event is set to be staged under a series of COVID-19 protocols.