Bolton boss Sammy Lee is hoping Mikel Alonso and former Celtic trialist David Degen will join Wanderers' week-long training camp in Austria.
Swiss winger Degen, who was part of the Switzerland squad for the 2006 World Cup, is currently with Borussia Monchengladbach.
Lee told the club's official website: "David likes to play wide right and exploit the flanks. He has a good turn of pace which could add a new dimension to our style of play."
He added: "I am hoping to invite the two players over to Austria with the rest of the first team squad so we can have a good look at them. Both players could interest us for next season.
"Mikel is a creative midfielder who has an excellent passing game similar to his brother Xabi."
