PARIS: This week the glamour of a tie between Barcelona and Paris Saint-Germain heralds the dawn of the Champions League knockout phase, but the world’s most lucrative and compelling club competition returns still overshadowed by the coronavirus crisis as well as by looming changes to the tournament itself. Four years ago, when PSG last visited the Camp Nou, they arrived with a 4-0 first-leg advantage and left eliminated after a 6-1 defeat on a night the 96,000 spectators present will never forget. On Tuesday Neymar, now with the Parisians, will miss the return to his old home due to injury. The fans will be missing too, yet the spectacle of a huge European game going ahead behind closed doors due to Covid-19 restrictions is no longer so unusual. What is new is the extent to which travel bans are creating havoc and have already forced UEFA to switch several ties to neutral venues. RB Leipzig have been denied home advantage in their first leg against Liverpool on Tuesday due to a ban by German authorities on travellers from the UK. That game now goes ahead in Budapest, which will also host Borussia Moenchengladbach against Manchester City the following week. Similar restrictions on travellers from Britain entering Spain have forced Atletico Madrid’s first leg at home to Chelsea to be moved 3,000 kilometres to Bucharest. It may be football in an empty stadium, often on neutral ground, but the Champions League knockout stages remain the absolute pinnacle of the club game, the theatre in which so many memorable matches have been played in recent times. Even last year’s ‘Final Eight’ behind closed doors in Lisbon produced Bayern Munich’s stunning 8-2 mauling of Barcelona and Manchester City’s shock loss to Lyon. But this time it is impossible to ignore the spectre of change hanging over the Champions League, with UEFA clearly prepared to cede more and more ground to the continent’s biggest clubs in order to prevent a breakaway ‘Super League’ coming to fruition. There is widespread support for plans to revamp the group stage from 2024, as has been reported across the continent in recent days. It is understood those plans would see the number of clubs taking part in the group stage increase from 32 to 36, with teams playing 10 group games instead of six in a so-called ‘Swiss system’ –– one pool of 36 teams, with nobody playing anyone else more than once. Teams will have to play as many as 19 games to win the trophy, compared to 13 now. The proposals are backed by the European Leagues organisation, which last week said “the so-called ‘Swiss Model’ is an improvement compared to the more radical proposals that emerged in 2019”, of four groups of eight. The changes have been championed by Juventus chairman Andrea Agnelli in his role as head of the European Club Association. A reformed Champions League is, in reality, the lesser of two evils compared to the possibility of a Super League. For despite the talk of sporting merit, Agnelli’s Juventus and Europe’s other financial heavyweights want to entrench a system that guarantees them access to the biggest competition there is. That is already the case. The only club from outwith the so-called ‘Big Five’ leagues involved in this season’s last 16 is Porto, twice European champions and still the last club from outwith that elite to win the Champions League, in 2004. It would be a considerable surprise if they eliminated Agnelli’s Juventus, for whom Cristiano Ronaldo is still the leading light aged 36. So much about the Champions League is predictable, but so much remains unpredictable, especially as the ageing Ronaldo and Lionel Messi approach the end of their glittering careers.