23-year-old Blackman signed a contract until the end of the season, with an option for a further 12 months, having been on trial at Bloomfield Road or a number of weeks.
The left winger, who can also play at left-back, has been out of contract since the end of last season, having left Maidenhead United after just two appearances for them. He also turned out for Dover Athletic in 2014, and has endured unproductive spells with Plymouth, Celtic, Bristol City and AFC Wimbledon, having progressed through the academy systems at both Arsenal and Spurs.
In May 2014, he aged a short-term trial with Leeds United, with President Massimo Cellino keen to revive the career of the youngster. He joined them on their pre-season training camp to Italy, but no deal could be struck and Blackman was left without a club until Blackpool came calling.
As reported on the official Blackpool website, the deal keeps Blackman at Bloomfield Road until the end of the season, with the option for a further 12 months should it be taken up.
Alongside the arrival of Blackman, the Seasiders also confirmed the arrival of 25-year-old midfielder Formose Mendy, with the once-capped Guinea-Bissau international signing subject to international clearance. A veteran of the Spanish lower leagues, he spent last season in La Liga with Sporting de Gijon, before cancelling his contract at the end of August. He also has experience of French football, having come up through the youth and reserve ranks at Lens.
With the moves subject to Football League clearance, neither of the pair will be able to make their debuts on Tuesday night, with Blackpool heading to Middlesbrough. However the home tie against Cardiff on Friday night could be the perfect time for the due to impact the start of the Seasiders’ dismal season.