Arsenal loan star Yaya Sanogo suffers setback after Ajax coach De Boer questions ability

Yaya Sanogo has signed for the Amsterdam giants on a season-long loan, but Ronald De Boer is unconvinced.

Arsenal prospect Yaya Sanogo still has some work to do if he is going to convince those behind the scenes at Ajax of his value to the club - if comments from coach Ronald De Boer in Voetbal International are anything to go by.

The 22-year-old has moved to Amsterdam on a season-long loan deal and will be keen to impress and potentially force his way back into the Gunners’ plans.

A hat-trick in a behind-closed-doors friendly against Qatari side Umm Salal was a good start, but one man remains unconvinced about the striker.

That man is De Boer, brother of Ajax manager Frank, and the youth academy assistant coach at the club.

Writing in Voetbal International, the Dutch football legend offered up a pretty scathing assessment of the Frenchman: "I heard Frank [De Boer] say last week that this is one of the best squads with whom he has ever worked.

"However, when I see Sanogo, I still have my doubts. I have still found no qualities with which you can do something.”

The French youth international spent last season on loan at Premier League side Crystal Palace, but failed to find the net for the Eagles in the top-flight.

Capped by Les Bleus at five different levels of youth football, Sanago was part of the side that won the under-20 World Cup in 2013.

Once tipped for a bright future in the game, the youngster will be hoping to prove De Boer and any other doubters wrong over the course of the season to come.

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