The agent of Feyenoord starlet Luc Castaignos insists Arsenal are the only serious suitor for the 17 year-old.

Arie Treffers has dismissed talk of a bid from Manchester United, insisting: "Specifically, in early July we spoke with Arsenal.

"There will be people who call me who say that they represent a club, but whether that is serious, I cannot check.

"Luc is only 17. We believe that he is too young in order to leave the Netherlands."

Treffers says any agreement with Arsenal - or anyother foreign club - must include a loan back option to Feyenoord.