Boris Mathis, released by Metz, was signed and was joined by Dutch defender Nathangelo Markelo, Anton Donkor returned on loan from Wolfsburg before Adeniran followed late on the final day of the window.
Jose Baxter has also returned to the club this summer, signing a 12 month deal.
“We're a different team than we were last year," Unsworth told the Liverpool Echo.
“It's new, young team. Last year has gone and this year is going to be a totally new experience for some players.
“This year is a developing year.
“If we rewind the clock back three years, it's like the start of a new cycle of footballers at our club.
“You're looking at Gibson and Bowler, young kids who have come in and don't yet know the way we play, so it's a brand new team and it's going to be a development year."