As football adages go, it's a transfer truism up there with the most memorable.

Yet clubs consistently choose to ignore it in the hope of bucking the trend and striking gold.

Never be persuaded to buy a player on the strength of a good showing in an international tournament.

With Euro 2020 now up and running - and the Copa America taking place on the other side of the globe in Brazil - there has never been greater scope for Liverpool and other Premier League clubs to be seduced by performances on the big stage.

And already the names are being bandied about, the players who previously have flown under the radar - whether that be through their league having a lack of wider exposure on television or playing for an unheralded club - now capturing the attention of the wider public for the first time.

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On Saturday, Switzerland wing-back Kevin Mbabu and forward Breel Embolo, who both play in the Bundesliga, earned rave reviews.

Two days later, it was the turn of another German-based player, Patrik Schick of Bayer Leverkusen, to prompt an enthusiastic response following his memorable brace for the Czech Republic in Scotland.

And a few hours afterwards, Alexander Isak of Sweden - La Liga young player of the year with Real Sociedad - was the subject of great adulation from the Reds fanbase.

Liverpool aren't daft. They will know all about every leading or promising talent on show in the European Championships, with some no doubt featuring - such as Germany's Florian Neuhaus - on their list of potential targets.

That homework should avoid them making the kind of missteps that have hampered almost every team in past years, although the Reds have usually avoided such a pitfall.

It wasn't always that way. Torben Piechnik and Phil Babb were bought after the 1992 European Championship and 1994 World Cup respectively, but neither hit anywhere near the heights they did during those tournaments while at Anfield.

Patrik Berger was a more successful purchase, shooting to prominence with the Czech Republic in 1996 and going on to have a long and successful Liverpool career.

Players often don't need to have particularly stellar tournaments. Vegard Heggem didn't kick a ball while with Norway at the 1998 World Cup before moving to Anfield while Xabi Alonso (Euro 2004) and Dirk Kuyt (2006 World Cup) were not regulars at the finals.

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More recently, Alisson Becker and Xherdan Shaqiri were on Liverpool's radar long before the 2018 World Cup after which they arrived, and in 2010 Milan Jovanovic had already agreed a move to the Reds before famously scoring a winner for Serbia against Germany in that year's World Cup.

Raul Meireles, a regular in that tournament for Portugal, joined only days before the transfer deadline in the August.

But perhaps the biggest myth surrounds the purchase of Senegalese duo El Hadji Diouf and Salif Diao, stars in their country's run to the quarter-finals of the 2002 World Cup.

A deal was actually agreed with Liverpool before the finals for Diouf, while Diao had already been a target with a transfer negotiated in principle during the tournament itself.

Not that it made their purchases any more justified. Indeed, perhaps it was Reds supporters rather than the club itself whose view of the pair was influenced by events in Japan and South Korea that summer.

The evidence, though, suggests Jurgen Klopp and Liverpool sporting director Michael Edwards are too canny to fall into such a trap over the coming weeks. After all, it's the kind of mistake that can cost both millions of pounds and one or two reputations.