Central Defender Danny Kelly made his debut for the Norwich City Under-18s in the 1-0 win against Fulham on 3rd February 2007, and was named man of the match. A product of Norwich's acadamy, although originaly with Cambridge United , Peterborough and Histon, he was offered a scholarship with the Canaries starting in the 2007/8 season. Along with David Cooper, he has had a trial with the Republic of Ireland Under-16s. Danny is the brother of former City scholar Ross Kelly and current scholar Sam Kelly

In February 2006, he was offered a scholarship with the Canaries to commence in August 2007.

In March 2007, Irish youth coach Sean McCaffrey said "Danny Kelly, who's a centre-half or centre-midfielder who also plays at Under-16 level. He is another skilful one and will be one to watch when he gets into full-time training at Norwich."

In the summer of 2008, Danny was called up to a training camp with the Republic of Ireland's Under-19 side; which he later captained.

In May 2009, Danny was rewarded with his first professional contract with the Canaries signing a one-year deal with a one-year option

Kelly was released on 14th May 2010 and had not played for the Canaries although he played 16 times for the Reserves in 2009/10 scoring twice. He was on the first team bench five times.

Kelly joined Barnet at the end of June 2010 and made his league debut in the 2-1 defeat to Chesterfield on 7th August 2010

He had made 4 appearances for Barnet before being loaned to Eastbourne Borough on 8th March 2011 for one month. He made his debut on the same day in a 2-1 defeat at Wrexham.

After Barnet's narrow escape from relegation to the Conference at the end of the 2010/11 season, Danny was released by new Barnet manager Lawrie Sanchez

He joined Cambridge City on 26th August 2011. He then headed to Australia before returning to England and Cambridge City in March 2014.

Danny joined St Ives Town in 2016/17.