Mizuno (left) and Samaras are the Hoops' latest recruits

Mizuno, capped three times, joins Celtic from J-League side JEF United while Samaras has signed up for the remainder of the season.

The 22-year-old Mizuno joins his fellow countryman Shunsuke Nakamura with the Scottish champions.

Celtic have the option of making Greek striker Samaras' deal permanent.

Mizuno has won youth international honours for Japan, gaining his first full cap in March 2007 in a friendly against Peru, before winnng a further two caps in last year's Asian Cup.

Samaras, 22, meanwhile, has been out of favour at the City of Manchester Stadium, signalling Hoops' boss Gordon Strachan's move.

"I would be happy to go to Scotland. I would not have any problem with leaving the Premier League - playing football is the main thing for me," Samaras told the Daily Record earlier.

"It would also be very interesting to play European football with Celtic."

Samaras was signed by City boss Stuart Pearce for �6m in January 2006 from Heerenveen, after an impressive 25 goals in 31 starts for the Dutch side.

And with Euro 2008 on the horizon, he believes his ambition of playing for his country could be boosted by making the move to the Scottish Premier League champions.

"At this moment I need to find somewhere to play football.

"I have the European Championship this summer and I need to play games before then."

Samaras, capped 12 times, had previously been linked with moves to Rangers, Bolton, Middlesbrough, and Espanyol.