Blackpool have signed Arsenal centre-back Daniel Ballard on loan until January and Iceland defender Daniel Gretarsson on a two-year contract.
Ballard, 21, started Northern Ireland's last two Nations League games against Romania and Norway in September.
But he is yet to make his senior Arsenal debut, and had a loan spell at Swindon last season cut short by injury after just three appearances.
Gretarsson, 25, signs from Aalesunds FK for an undisclosed fee.
"It's a great opportunity to play for a club like Blackpool," Ballard said. "I'm really determined to do well here."
Gretarsson, who won his first Iceland cap in January 2020, added: "English football is very big in Iceland, and it's one of the best countries in the world to play the game.