Sunderland manager Gus Poyet refused to throw any light on reports linking the team with Lille striker Salomon Kalou.
Poyet is anxious to add attacking backup to his squad before the transfer window shuts on September 1 and while they have agreed a fee for Liverpool frontman Fabio Borini.
Borini’s refusal to pursue the transfer has led to Poyet seeking alternative transfer targets, with former Chelsea forward Kalou hottest to be linked.
Reports suggest the 29-year-old Ivory Coast international held talks with the Premier League club, but Poyet was in no temper to discuss transfer contracts to the press following Sunderland’s 1-1 draw at home to Manchester United on Sunday.
“I am going to have to do research at this football club into who is leaking information every week. It cannot be always the player’s agent,” the Uruguayan boss said.
“A few agents, OK, you can blame them, but there is too much information coming out and I don’t like it.
“I am not going to comment on any players, sorry.”
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