Brett will now be at the Gnoll until at least the end of the 2004/2005 season.
Neath Director Mike Cuddy said: "Brett was keen to extended his contract for a further year.
"As a club we have to secure players of his quality on long-term contracts if we are going to build a team capable of performing in the European Cup, as well as performing in the Welsh Scottish league.
"Many sides in Wales and over the border have courted his services, and we are delighted that he is staying at the Gnoll as Brett is performing on top of his game and is clearly the best openside in Wales at the moment"
The Neath team to play Edinburgh at The Gnoll, on Saturday 27th April
2002, kick off at 2.00pm, will be as follows : -
Shaun Connor; Kevin James, James Storey
Dave Tiueti, Dean Dewdney; Lee Jarvis, Patrick Horgan; Nathan Bonner-Evans,
Brett Sinkinson, Alfie Mocelutu,
Gareth Llewellyn (c), Steve Martin,
Andrew Millward, Steve Jones, Duncan
Replacements: Gareth Morris, Barry Williams, Allan Bateman, Andrew Howell,
Paul James, Lyndon Bateman, Steve Tandy
GB7s women left their England base to train in Wales this week. Olympic Games hopeful Rachael Burford gives WRU TV's Graeme Gillespie her thoughts on Welsh teammate Jasmine Joyce - a 'one touch wonder'
The GB7s women's squad is currently training at Wales' Centre of Excellence where assistant coach Richie Pugh tells WRU TV's Graeme Gillespie some 'tough calls' will have to be made when it comes to finalising the 12 spots for Rio's Olympic Games.
Wales U20's Billy McBryde is looking forward to starting his first game against New Zealand this afternoon in the World Rugby U20 Championship where his side are looking to gain revenge from last week's pool defeat to the Kiwis.