The former Middlesbrough player, who has won five caps for Scotland, joined Tranmere on a two-year contract in July 2006 and it is believed that he may well join Aberdeen, currently sixth in the SPL, when that deal expires.
28-year old Stockdale has played an impressive 87 games for Tranmere since joining the club, with only two appearances from the bench, and many he would say he has been mainly solid during his time at the club.
A player who times his tackle often to perfection, Stockdale does sometimes get exposed for his lack of pace but that excellent tackling ability often gets him out of this problem, but he is still to get a goal in a Tranmere shirt.
Should the player leave in the summer, this may well pave to way for youngster Danny Holmes to make his debut, with the player having thoroughly impressed not only in the reserves over the past fews years but also during a two-month loan spell at Southport at the start of 2008.
It is believed that Stockdale, along with most of the other out of contract players at Tranmere this summer has been offered a new deal with the club.