He was part of the
Dublin side that won the
All-Ireland Under-21 Football Championship in 2003. He made his senior debut for
Dublin Football during the 2005
NFL campaign. Keaney was announced in the International Rules team to play in Australia but had to opt out due to an ankle injury. In first full term as a Dublin football player in 2005, he was part of the
Dublin team that won the
Leinster Senior Football Championship against
Laois. He opted out of the football team in 2011 to rejoin the hurling team.
2006 Despite a late return to county football in the 2006
National Football League he finished the league as the second highest scorer with a score of 2-12 (0-6f). In his opening game in the Championship for
Dublin in the
Leinster Senior Football Championship quarter final, he is regarded as single-handedly winning the game for
Dublin. In what proved to be a poor Dublin performance, Keaney scored a 0-8 (0-6f) against
Longford in a game that sent
Dublin into the
Leinster Senior Football Championship Semi-final against
Laois in
Croke Park. His form continued against
Laois as Keaney added another 0-06 (2f), as
Dublin strolled into the Leinster final. Conal Keaney (for football) and
Cork hurling star
John Gardiner were named as the Vodafone Players of the Month for June 2006. Keaney won a Leinster senior football medal with
Dublin in their victory in the final in 2006. At club level, Keaney made it to the fourth round of the
Dublin Senior Football Championship with
Ballyboden St Endas, losing to southside rivals
Kilmacud Crokes. In October 2006 Conal was called up to represent
Leinster in the
Railway Cup. Keaney scored 1-03 against
Ulster in the
Railway Cup semi-final, sending
Leinster to the final for a second year in a row. He has been nominated for an all-star for his 2006 performances in the half forward line. Keaney was on the winning team for
Leinster in the Martin Donnelly Cup final against
Connacht scoring (0-4, 3 frees).
2007 He won the
2007 O'Byrne Cup for Dublin against
Laois at
O'Connor Park in Offaly. The game finished on a scoreline of 1-18 to 2-13 against Laois. he finished the tournament with 0-12 (0-4f). Conal was the highest scoring player in the Dublin Senior team in the Allianz league, he scored 1-18 (0-8f). In the replay Keaney scored a total of 0-4 (0-3f) and Dublin progressed to the semi-final. The semi final proved a much easier test for Dublin and scored 3 points in Dublins victory over
Offaly. Keaney won a
Leinster Senior Football Championship medal in Dublins 2007 final victory over
Laois.
2008 Conal won his second Dublin Senior Hurling Championship medal in 2008.
2009 Keaney won a
Dublin Senior Football Championship medal for Ballyboden St Enda's in 2009 against
St Judes in
Parnell Park. He then won a
Dublin Senior Club Hurling Championship medal, his third in a row, when Ballyboden St Endas beat
Craobh Chiaráins in the final. He crowned off a great season by being nominated as Dublin Footballer of the Year. Keaney also won a
Leinster Senior Football Championship medal with Dublin in 2009 at
Croke Park. His 2009 season finished with speculation that he may return to inter county hurling. He confirmed in January 2010 that he would remain with the football panel for 2010.
2010 Early in 2010 Keaney announced that he would stay with the Football squad for the 2010 season. He was however utilised mainly as a substitute for the 2010 season. He won a fourth SHC club title with Ballyboden ==Hurling==