Defender David Atkinson has left Carlisle United by mutual consent.
The 23-year-old former Boro academy player joined United on an emergency loan deal in March 2015.
He made a total of 37 appearances for the Blues in his near two-year stay, which included two from the bench this season.
He joined Northern Premier Division outfit Blyth Spartans on-loan in December 2016, which was extended at the start of this month.
David is a great lad but, with the additions we’ve made to the squad, he hasn’t been able to get the game time he wants and needs with us this season.
“He knows we’re going through a progressive stage as a football club and he wants to give himself the best opportunity to kick his own career on. He’s a good lad and a really hard worker and he’s desperate to be involved."
The Carlisle United manager Keith Curle says his side's 1-all draw with Morecambe this weekend was 'a point earned'.
The result followed two straight losses for the Cumbrians. The Blues came from behind to equalise, thanks to Charlie Wyke.
Watch Keith Curle's reaction to the result:
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Carlisle United manager, Keith Curle, says he's looking forward to the January transfer window.
The United boss won't have a blank chequebook and will have to be creative in order to improve his squad:
Carlisle United Manager Keith Curle says he's looking forward to finding out what kind of budget he'll have to improve his squad in the January Transfer Window.
As and when needed I will get told exactly what is there to spend. But in the meantime what we have been told to do is business as usual, which is scouting, looking to recruit players and identify players that we think can improve us."
The Blues play Yeovil on Saturday before a busy run over the Christmas period.
Carlisle United were beaten at home for the first time since April, as they crashed out of the FA Cup against Rochdale.
Brunton Park has been a fortress this year, but it could have been breached several times before the break, as the League One visitors imposed themselves.
Rochdale did take the lead minutes into the second half, when Steve Davies' deflected shot looped in.
Carlisle United fought their way back into the game and came close, but Rochdale's Nathaniel Mendez-Laing slotted home deep into injury time to ensure the League One team progress to the Third Round of the FA Cup.
Carlisle United remain second from top of the league.
The Blues took away one point after a 2-all draw to Grimsby Town last night with goals from Charlie Wyke and Zak Mills.
On Saturday they face Mansfield Town at Brunton Park.
Carlisle United has confirmed that plans to build a new stadium in the city have been shelvedRead the full story ›
Carlisle United will play Mansfield in the second round of the EFL Trophy.
The blues beat Fleetwood Town 4-2 last night to progress in a record breaking night for them.
The victory made it 8 in a row for United for the first time in the club's history.
Danny Grainger scored in his sixth consecutive appearance equalling another club best.
Our sports reporter, Ryan Dollard, got Carlisle United's Jason Kennedy to dish up some dirt on his teammates: