Declan O'Brien (footballer)
|Full name||Declan O'Brien|
|Date of birth||16 June 1979|
|Place of birth||Dublin, Ireland|
|Height||1.8 m (5 ft 11 in)|
|2009||→ St Patrick's Athletic (loan)||12||(1)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 21:10, 20 November 2013 (UTC).
† Appearances (Goals).
O'Brien started his professional career with Drogheda United scoring on his League of Ireland debut at Cobh Ramblers on the opening day of the 2001–02 League of Ireland. He was the club captain and talisman and he captained the club to one FAI Cup in 2005 , a game where he scored, two Setanta Cups and the clubs only ever title win in 2007. Fabio is the clubs all time leading goalscorer with 90 goals in 184 games, 76 in domestic league and the rest in domestic cups (Setanta Sports Cup, FAI Cup and League of Ireland Cup) from his first spell at Hunky Dorys Park.
On 15 January 2009, O'Brien made the controversial move across Louth to Drogheda United's local rivals Dundalk who had just been promoted to the League of Ireland Premier Division. He played out of position as a left winger and left in the transfer window in July. He managed 4 goals in 15 appearances.
St Patrick's Athletic
He signed for St Patrick's Athletic in July for the rest of the 2009 season on loan . He scored on his debut in the Europa League against Valletta and repeated the trick in the second leg  to send St Patrick's Athletic into the next round.
O'Brien then scored in both rounds again against FC Krylia Sovetov Samara to become St Patrick's Athletic all time record scorer in European competition. He was Player of the Month for July 2009.
He finished the season as joint top scorer with St Patricks despite being there for just four months.
In December 2009, O'Brien joined Maltese football club Valletta (the same team that he helped eliminate in the Europa League qualifiers) on a free transfer, after his loan contract with St Patrick's Athletic expired the previous month. O'Brien holds the Irish record for consecutive goals in European ties (4).
On 15 February 2010 making his 6th league appearance for Valletta, O'Brien scored his first league goals in a 6–0 victory over Dingli Swallows. O'Brien scored 4 goals in the match.
Then on 27 February, on his 7th league appearance Declan managed to score 2 goals in just 15 mins when he was substitute in the 75th minute against Tarxien Rainbows with the score finishing 6–2 for Valletta. He followed this up with another brace in the Gozo cup against Gozo a week later. He also scored 2 weeks later in the U*BET F.A Trophy Cup against Birkarkara in a 3–1 win.
He won his first piece of silverware with Valletta F.C., when winning the 100th League Anniversary Cup against bitter rivals Floriana on 13 April 2010. After the end of the 2009–2010 sesson he was released by Valletta. He received a medal for the trophy but was not involved in the final as he agreed to be released beforehand.
He scored his first goal for Athlone at the Brandywell on 10 September.
He signed for Monaghan United in December 2010 on a two-year deal. He scored two on his debut against Cork City in 2–2 draw at Turners Cross on 1 April. He then scored the winning goal on his home debut v Longford Town in a 1–0 win the following week.
Return to Drogheda
He scored the opener in the 2012 League of Ireland Cup Final against Shamrock Rovers at Tallaght Stadium. The Drogs won 3–1 which completed Fabio's set of medals in the domestic game having won the League title, FAI Cup and the Setanta Sports Cup (twice) in his previous stint at the club. To add gloss to the victory, he was also awarded 'Man of the Match'. 
Fabio was in the MNS Team of the Year 2012, along with Drogheda team-mate Gabriel Sava. He scored 18 goals in all competitions for Drogheda to become the first Drogheda player to score more than 100 goals for the club. On 22 November 2012, Fabio signed a one-year deal with the Drogs to keep him at United Park until the end of the 2013 season.
On the opening of the January 2015 transfer window, O'Brien joined NIFL Premiership side and current Irish Cup holders Glenavon on an 18 month deal. O'Brien scored a debut hattrick in a 4-2 win over Ballymena United.
- Valletta F.C. – 2010
- Valletta F.C. – 2010
- "Drogheda United FC First Team Squad 2012". Retrieved 4 May 2012.