Greg was a very promising young striker with the West Ham United youth team and signed a one year contract with the club in July 2004. He failed to break into the first team, going out on a one month loan to Lincoln City in August 2004, before going on loan to Canvey Island in December for the remainder of the season. He was released and joined Rushden & Diamonds on 21 June 2005. He made his debut on 6 August 2005 against Darlington, but one goal in ten starts saw him lose his place. He made 20 starts and a further 8 substitute appearances that season, while the following year saw him make just 5 starts before going out on loan to Hucknall Town on 20 February until the end of the season.

He was subsequently released, and joined Bishop Stortford where his goalscoring became prolific for the Conference South side during the 2007/08 season. On 8 August 2008, he joined Burton Albion where he remains their top scorer.  In three and a half seasons with the Brewers, he helped them attain Football League status and scored 37 times in 118 appearances. On 24 November 2011, Greg went on loan to Aldershot Town until 7 January. On his return after six appearances, he went on a further loan of one month to League Two side Crewe Alexandra on 13 January 2012, scoring the winner on his debut at Oxford Utd the following day.

Appearances

2005/2006 - squad number 8

CCL2	6.8.05	Darlington (H)
CCL2	9.8.05	Mansfield Town (A)
CCL2	20.8.05	Chester City (H)
CC1	24.8.05	Coventry City (H)
CCL2	27.8.05	Lincoln City (H)	1 goal
CCL2	29.8.05	Grimsby Town (A)
CCL2	2.9.05	Peterborough U (H)
CCL2	10.9.05	Oxford Utd (A)
CCL2	13.9.05	Macclesfield Tn (A)
CCL2	17.9.05	Stockport Co (H)
CCL2	24.9.05	Notts County (A)	as sub
CCL2	27.9.05	Northampton Tn(H)	as sub
CCL2	1.10.05	Rochdale (A)	as sub
CCL2	7.10.05	Bury (H)
CCL2	15.10.05	Wycombe Wdrs(A)
LDV1	18.10.05	Southend Utd (H)	1 goal
CCL2	22.10.05	Shrewsbury Tn (H)
CCL2	29.10.05	Barnet (A)
FAC1	6.11.05	Halifax Town (A)
FAC1r	15.11.05	Halifax Town (H)	as sub
FAC2	3.12.05	Leyton Orient (H)	as sub
CCL2	17.12.05	Chester City (A)	as sub
CCL2	28.12.05	Cheltenham Tn (H)	as sub
CCL2	31.12.05	Torquay Utd (A)
CCL2	2.1.06	Bristol Rvrs (H)
CCL2	7.1.06	Peterborough U (A)
MCF	24.1.06	Peterborough U (H)
CCL2	22.4.06	Wycombe Wdrs(H)	as sub

2006/2007 - squad number 16

Conf	1.9.06	Kidderminster (A)	as sub
Conf	16.9.06	Stafford Rgrs (A)	as sub
Conf	23.9.06	Woking (A)	as sub
Conf	30.9.06	Burton Albion (H)
Conf	3.10.06	Morecambe (A)	as sub
Conf	6.10.06	Stevenage Boro(H)
Conf	10.10.06	Halifax Town (H)
HSC1	17.10.06	Cogenhoe Utd (H)
HSCQF	31.10.06	Ford Sports (A)
FAT1	16.12.06	Scarborough (H)	as sub