The 21-year-old defender was released by Aston Villa on Wednesday.
The 21-year-old left-back confirmed on Twitter this afternoon that he would not be plying his trade at Villa Park next term following the club's decision not to extend his contract.
Kinsella and Grealish progressed through Villa's academy together, and the 20-year-old midfielder admits he's "gutted" that the defender is leaving the club.
Gutted to see one of my best pals leaving. All the best in the future bro, I know you'll have a great one! ❤️ pic.twitter.com/cptqmuwEuq— Jack Grealish (@JackGrealish1) May 11, 2016
Kinsella never made a first-team appearance for the West Midlands outfit, but he had made a matchday squad under former Tim Sherwood and, if not for his sacking in October, the defender may have been given a chance to impress in the senior set-up.
His final appearance in a Villa shirt came at the Emirates Stadium on Tuesday night when the club's Under-21 side slumped to a 3-1 defeat at Arsenal's Under-21s.
It also remains to be seen where Grealish's future lies. He is arguably one of the few assets that Villa boast in the first team, prompting the question: is he too good for the Championship? Premier League clubs might well try to keep him in the top flight, but being Villa through and through, he may be reluctant to quit the club just yet.