Brentford could face competition from Cologne for the signing of Robin Hack.
West London Sport revealed last month that Nuremberg winger Hack, 21, is the Bees’ first-choice replacement for Said Benrahma should the Algerian be sold this summer.
Talks have taken place with Nuremberg about a potential deal, but a number of German clubs have enquired about Hack and it appears that Cologne’s interest in him is strong.
West Ham look set to table a bid for Benrahma.
The Hammers identified Benrahma and Ebere Eze as key summer targets but missed out on Eze, who joined Crystal Palace from QPR.
David Moyes has been told he needs to sell before he can spend in the transfer market.
And he is on course to offload Grady Diangana, with a deal having been agreed with West Brom for the forward.
That would pave the way for West Ham boss Moyes to add to his squad and he is expected to make a move for Benrahma, who has attracted interest from a number of Premier League clubs.
Those clubs include Aston Villa, who have long been keen on Benrahma and his Brentford team-mate Ollie Watkins.
Brentford would want a sizeable fee for Benrahma, who has been a revelation since arriving in west London from Nice two years ago.