Bancroft's brother, Billy, was a Welsh rugby international and the first paid professional for the Glamorgan cricketing side.

As well as playing for Swansea at club level, Bancroft was capped eighteen times for the Welsh national team.

During Bancroft's career he scored 19 points against France in the 1910 international, at the time a record for a Welsh player in a single match.

Wales[2] Jack Bancroft was wicket-keeper for Swansea, and played Minor Counties Cricket for Glamorgan as early as 1908.

Bancroft was called up to the Glamorgan first team on nine occasions during the 1922 season before hanging up his gloves.