Eccles will battle with Ryan Jones for the number one shirt at the Horsfall Stadium, after he re-joined the club earlier this week.
Teenager Eccles has been on trial with Avenue throughout pre-season, appearing in the friendlies against Eccleshill United, Nelson and Consett.
In fact, the 19-year-old brilliantly saved a penalty in the victory over Eccleshill, and made a good one-on-one save to preserve the clean sheet at Consett.
Eccles came through the youth ranks at Burnley before moving to Carlisle United whilst still a youngster. He has spent time at Workington AFC and Barrow AFC, from whom he was released this summer.
Somewhat incredibly, in a trial period as a 14-year-old, Eccles was named on the bench for Barrow in a friendly at Altrincham, and was forced into action on the hour-mark as the starting keeper was carried off injured.