Auxerre defender Willy Boly and Rosenborg midfielder Markus Henriksen are Celtic targets, manager Neil Lennon has confirmed.
But he has rejected suggestions of a move for former Manchester United striker Michael Owen.
Boly, 21, is currently under contract until 2015 and could command a fee of up to £3.5m, with several other clubs believed to be interested.
The 20-year-old Henriksen has been capped eight times by Norway.
He rejected a £1.6m move to Club Brugge in January and has now made more than 80 appearances for the side who finished third in the Norwegian top flight last season.
French centre-half Boly has featured in 41 league matches for Auxerre, who were relegated from Ligue 1 last season.