Accrington Stanley are still in talks with goalkeeper Tony Warner about a possible move to the Reds.
The 38-year-old former Liverpool, Millwall and Tranmere stopper, played in the 1-1 draw with St Mirren on Sunday and pulled off a number of strong saves.
Cook confirmed talks are ongoing with the experienced keeper who would rival Ian Dunbavin for the number one spot.
Meanwhile Tom Eckersley has agreed a deal to join Stanley on a one-year deal after a trial at the club.
"I’m over the moon," said the 20-year-old. "I came here on trial a couple of weeks ago looking for a contract and that’s what I’ve done.
"There were a lot of lads here on trial at the start and I just had to believe in myself and do the best I could."
The centre back has come through the ranks at Bolton and was released earlier this summer.
Stanley boss Cook is now looking for him to take the next step.
"Tom has impressed us in pre-season and now we’re looking for him to continue improving," he said. "We have good competition in the centre of defence and that’s a good thing for the team."
n FORMER Stanley defender Sean Hessey has joined Blue Square Bet Premier side Barrow.