The 25-year-old defender has passed a medical and been granted a work permit and will go straight into the squad for Saturday's trip to London to take on Arsenal.
"I'm looking forward to the first game and I'm very happy that everything is done," Keinan said on www.blackpoolfc.co.uk.
"I just want to play for Blackpool and help this team.
"I had different offers but after I met the gaffer I was sure that I wanted to play for Blackpool."
Source: PA