Blackpool manager Ian Holloway has bolstered his squad just three days before the start of the club's maiden Barclays Premier League season with a quartet of signings - his first of the summer.
Defender Craig Cathcart, 21, joins from Manchester United for an undisclosed fee having agreed a three-year contract with the option of a further 12 months.
Midfielder Ludovic Sylvestre, 26, has arrived from Czech side Mlada Boleslav on a two-year deal with the option of a further year.
A similar deal has been signed by Elliot Grandin, a 22-year-old French winger from Bulgaria's CSKA Sofia who has also had Ligue 1 experience with Marseille.
The 21-year-old midfielder Malaury Martin, who has been capped by France at various youth levels, joins on a free transfer from Monaco having been on trial for the last month, signing a one-year deal.