Everton are ready to pounce on Sunderland midfielder Jack Colback after he rejected another contract offer, [football] direct news understands. Roberto Martinez is keen to look at Colback after the young midfielder turned down another contract with the Black Cats, prompting interest from a number of Premier League clubs.googletag.cmd.push(function() { googletag.display(“div-gpt-ad-1389116196215-0”); });Colback began his career with Sunderland and has since gone on to make 124 appearances at the Stadium of Light. However, the young English midfielder is keen to move on and Everton are leading the list of potential suitors. Martinez is keen to bolster his midfield options as it looks increasingly likely that loanee Gareth Barry will not extend his deal with the club.