Date of birth
Kelly signed a two-year-deal with the Mariners following the end of his contract at Port Vale.
The 23-year-old began his footballing trade at Norwich City, where he spent two years before joining the Everton academy in March 2012. Following his release in 2013, Kelly joined Cambridge City in February 2014, before returning to Norwich City later that year, working alongside assistant manager, Paul Wilkinson.
Kelly then signed a two-year contract at Port Vale in 2015, making a total of 49 league appearances over a two year period. In the 2015/16 season, Kelly scored Port Vale's Goal of the Season with a sensational effort against Coventry City on 7th February.