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Borussia Dortmund scout Artur Platek has revealed the extent to which Jurgen Klopp did his homework on Robert Lewandowski prior to signing the prolific striker.

The Liverpool boss disguised himself on scouting missions to Poland when he was considering taking the frontman from Lech Poznan to Dortmund back in 2010.

Klopp left no stone unturned before deciding to proceed with the £4million deal. It proved to be money well spent as Lewandowski blossomed into one of Europe’s most lethal marksman - scoring 103 goals for Dortmund before joining Bayern Munich when his contract expired in 2014.

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(Image: (Photo by Gareth Copley/Getty Images))

Platek told Polish news outlet Przeglad Sportowy: “From what I know, Robert Lewandowski was observed more than 30 times. That included secret visits by Jurgen Klopp at the stadium in Poznan, in cap and with a hood pulled over his head.

“Borussia could not take a large financial risk at the time, which is why coach Klopp personally went to scout Robert.”

Lewandowski’s future has been the subject of speculation once again this week with Chelsea and Manchester United both linked with a move for the Bayern attacker.