Youngster Joe Ledley, recovering from injury, has also flown out to be part of the squad, but will not take part in the training.
James Collins, Danny Gaddidon and Paul Parry were part of the original squad.
Wales squad: Danny Coyne (Burnley), Wayne Hennessey (Wolves), Martyn Margetson (Cardiff City), James Collins (Cardiff City), Mark Delaney (Aston Villa), Richard Duffy (Portsmouth), Rob Edwards (Wolves), Danny Gabbidon (Cardiff City), Peter Gilbert (Plymouth Argyle), Craig Morgan (Wrexham), Arron Davies (Yeovil Town), Mark Jones (Wrexham), Paul Parry (Cardiff City), Carl Robinson (Sunderland), David Vaughan (Crewe Alexandra), Chris Llewellyn (Wrexham), Craig Davies (Oxford United), Robert Earnshaw (WBA)