England keeper Forster undergoes Southampton medical

London: Celtic`s England international goalkeeper Fraser Forster has undergone a medical with Southampton, the Premier League club confirmed on Saturday, paving the way for a transfer worth a reported £10 million (12.5 million euros, $17 million).

"Of course we are interested, of course he did the medical tests, but since yesterday I have not spoken to the board and maybe when I go up for a drink they will tell me that," Southampton manager Ronald Koeman told the Daily Echo.

"For sure we are interested, but I didn`t hear he has signed."

Koeman also said Southampton had had a bid -- believed to be in the region of £4.5m -- rejected by Leeds for 20-year-old right-back Sam Byram.

"We lost (Calum) Chambers to Arsenal -- Byram was a player we had on the list and it`s true that we had a bid for him, yes," the Dutchman said.

"What I heard was that Leeds didn`t accept it."