He played Gaelic football at various times with his local clubs St Mary's in Kerry and Leixlip in Kildare.
His son Aidan made his debut for the Kerry senior team in their successful 2009 National Football League campaign.
In 1975, a 3–7 to 1–11 defeat of arch-rivals Cork gave O'Shea a Munster winners' medal in the minor grade.
[4] In 1976, O'Shea won his first Munster under-21 title as Kerry retained their provincial crown at the expense of Cork.
Kerry and O'Shea made it three Munster under-21 titles in a row in 1977 following a two-goal defeat of Cork.
In 1978, O'Shea made it an impressive four Munster under-21 titles in a row as Kerry retained their provincial crown at the expense of Cork.
O'Shea made his senior inter-county debut with Kerry in late 1976 versus Meath in Navan.
In one of the greatest games of football ever played [citation needed] 'The Dubs' triumphed and O'Shea was still left waiting for a senior All-Ireland final appearance.
The Kerry forward lobbed the ball over the head of Paddy Cullen, who was caught off his line arguing with the referee.
[7] In 1979, Kerry made it five-in-a-row in Munster as Cork fell by ten points in the provincial final.
Ger Power did not start the game, while John O'Keeffe got injured and Páidí Ó Sé was sent off during the encounter.
Another defeat of Cork in the provincial final gave O'Shea a fourth Munster winners' medal in succession.
Mikey Sheehy popped up again to score the decisive goal, as Kerry went on to claim a 1–9 to 1–6 victory in a game that contained sixty-four frees.
Kerry failed to score again to level the match and Offaly went on to win their third All-Ireland title ever.
'The Kingdom' bounced back the following year with O'Shea winning his third National League medal and his seventh Munster title.
Also in this centenary year, O'Shea was selected in one of the midfield positions in the GAA's Football Team of the Century.
O'Shea scored a key goal after eleven minutes and Kerry stormed to a nine-point lead at half-time.
A Paudge Quinn goal gave the Ulster men a six-point lead in the second half; however, the game was far from over.
Pat Spillane ran fifty yards up the field for a hand-passed goal to get Kerry back on track.
O'Shea continued to play with Kerry, winning his eleventh Munster title as captain of the team in 1991.
A one-point defeat of Connacht gave O'Shea a fourth Railway Cup winners' medal in 1982.