Sunderland boss Lee Johnson’s recent admission about disciplinary problems with Frederik Alves should be a major concern for West Ham United.

Read also: Insider claims West Ham have told £4m man to find a new club in January

The Hammers youngster joined the Black Cats on loan in the summer and he made an impressive start to life at the Stadium of Light.

The 22-year-old centre-back has made six starts for Sunderland so far but he is still yet to start a league game for the north-east outfit.

Alves is very highly regarded at the London Stadium and should have a very bright future ahead of him with West Ham.

Wigan Athletic v Sunderland - Carabao Cup Third Round
(Photo by Ian Horrocks/Sunderland AFC via Getty Images)

RONALDO NEEDS TO STOP WHINING.

There might just be a big problem on the horizon for the young Dane and the Hammers though.

West Ham ace’s disciplinary problems a big concern

Frederik Alves hasn’t really kicked on from his impressive early form for Sunderland.

And it seems as though there is a reason as to why.

After Sunderland’s Carabao Cup defeat to Arsenal, Lee Johnson told reporters about Alves’s lack of discipline during training, as quoted by The Chronicle:

Sunderland v Oldham Athletic - EFL Trophy
(Photo by Eddie Garvey/MI News/NurPhoto via Getty Images)

“With Frederik, it was an attitude error that knocked him out of the squad. A lack of discipline in training.”

Alves joined the Hammers from Silkeborg in January this year for around £1.2 million (Daily Mail).

The Denmark under-21 international has a long way to go if he is to force his way into the plans of David Moyes at the London Stadium though.

The Scot doesn’t suffer fools. And if the young centre-back’s attitude isn’t spot on, his time in East London will be short lived.

Perhaps he’s just not happy at Sunderland…who knows.

One thing is certain though, the 22-year-old needs to start acting more professionally if he is to succeed at any level in the game.

In other news…Report: West Ham now want to sign £30 million centre-back in January

So his flagrant disciplinary issues should be a real concern for West Ham and is something that Alves must address as a matter of urgency.

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