Marcelo Bielsa reportedly has two concerns over Leeds United summer signing Robin Koch.

That’s according to a report from Football Insider, who claim they have been informed by a Whites source that Bielsa believes Koch ‘is too soft’ to thrive in the top flight.

The report adds that he ‘doesn’t like the aerial challenges’, which is thought to be a 'major issue' at Elland Road.

Koch, on £33,000-a-week in Yorkshire, has missed a large chunk of his first season with the Whites through injury and appears to have fallen behind Liam Cooper, Diego Llorente and Pascal Struijk in the centre-back pecking order upon his return.

Transfer Tavern take

We all know that Bielsa doesn’t like to rush players back from long-term injuries. Koch has been involved in five matchday squads since returning from a knee problem, coming on as a substitute in three of those.

However, with Cooper, Llorente and Struijk all impressing in recent weeks, we feel it is just a case of Bielsa remaining loyal to those three.

Koch has actually averaged more aerial duels won per game than both Llorente and Struijk this season, as per WhoScored, so we’re not so sure on the reported concern in the air.

The German’s time to impress will come around again, and should he take his chance, these concerns could soon disappear.

In other news: David Ornstein reveals Leeds United man played key role in ESL collapse, find out more here.