Chris Mepham says Nations League games against Belgium and Poland offer Wales the chance to gain World Cup momentum.
While Wales are aiming to avoid Nations League relegation this week, the fixtures are also the last for Rob Page's side before the World Cup.
"It can be difficult to give your full focus when you've got the opportunity of a lifetime around the corner," said Bournemouth defender Mepham.
"But these games are really important to fine-tune what we need to work on.
"We don't have the luxury of a warm-weather training camp where you can bond with each other, train, build your fitness and have some preparation games.