Johnson has done well in the reserves but has yet to make his mark on the first team.
The 20-year-old spent two months on loan at Hull City last season, making 13 appearances and scoring 2 goals, and made his first team debut for United against Charlton.
The West Bromwich born striker will be keen to impress during his time at Bloomfield Road and he made his Blackpool debut in yesterday's 1-0 home defeat to Luton Town.