Keane has signed a deal for the rest of the 2017/18 season and also the 2018/19 campaign.
Keane spent time at the Wolverhampton Wanderers youth team and signed his first scholarship in July 2012.
However, after two years, Keane was released by the club in February 2014.
Following his release, Keane joined then-SkyBet League One side Notts County in July 2014.
He made his debut at Meadow Lane in August 2014. Keane made his return in his second appearance, in a 2–1 loss against Bristol City in August 2014.
At the end of the 2014/15 season; Keane was among ten players to be released by the club following their relegation to League Two.
In August 2015, he was signed by National League North side Nuneaton Town along with his brother Jordan Keane.
Keane made thirty-one appearances for Nuneaton before joining Worcester City at the start of the 2016/17 season.
He made thirty-seven appearances and was one of the stars of a difficult season for City, scoring 9 goals and assisting with fourteen more.
Keane then joined Kidderminster at the start of this season and made just four appearances before his contract was cancelled by mutual consent.
Reds boss John McDermott said: “I’m absolutely over the moon to have got Cieron, we tried for him earlier in the summer but obviously due to Kidderminster being full time that was the only factor in why we couldn't do it then.
"Cieron plays exactly how I used to play! He will play my style of football and he is a fantastic addition for us. Once he became available it was a no brainer for me to bring him to us. He's a left back and can play left wing too, he's an attacking player and loves to join in the play and can score goals too.
"He likes to be on the front foot and he is a good defender, he gives us more creativity and competition for places. It's a fantastic signing for us".