Wales have added Leeds United's teenage midfielder Charlie Crew to their squad for the Nations League matches against Turkey and Montenegro.
Cardiff-born Crew, 18, has yet to make a senior appearance for his club, but made his international debut against Gibraltar in June.
Wales have not yet announced who he is replacing in the squad, but winger Rabbi Matondo is a major doubt after injuring his hamstring.
The 23-year-old Rangers forward was forced off the field during the first half of his side's 3-0 defeat at Celtic on Sunday and is being assessed by his club's medical staff.
Wales face Turkey in Craig Bellamy's first game in charge on Friday, before taking on Montenegro three days later.