Danny Grewcock was born in 7/11/1972] in Coventry and attended Woodlands School, Coventry. His career started with Barkers Butts and Coventry and playing for the Warwickshire U21 side at age 19. In 1996-97 he moved into the professional ranks with Coventry and still supports Coventry FC.

He played for England for the first time in 1997 on the tour to Argentina, scoring his first international try in the Test in Buenos Aires. He joined Saracens later that summer but switched to Bath for the 2001-02 season.

He played in all three Test matches for the Lions against the Wallabies and in 6 of the 10 tour matches. The Lions tour brought out arguably the best the world has seen from Grewcock. He was prolific, matching fellow lock Martin Johnson.

He was only able to make one appearance on the pitch during the 2003 Rugby Union World Cup after breaking a hand in the Uruguay match and missing earlier games in the competition due to a toe injury. His injuries left head coach Clive Woodward with no choice but to fly out Simon Shaw as a replacement. He finally received his World Cup medal in December 2004. He started in all three Autumn 2004 test.

He was selected for the 2005 Lions tour to New Zealand