Kepa has joined Spain's standby squad for the Euros, but Buyo admits he's been disappointed with his progress since leaving Athletic Bilbao.
Buyo said, "He was an extraordinary goalkeeper who was showing great potential, but he has had a significant setback at Chelsea.
"I think he lost his great opportunity to sign for Real Madrid and it is a shame because not playing consistently reduces his chances of playing for the national team.
"We are going through a major goalkeeping crisis. The main teams in our league do not have selectable goalkeepers and there is an excess of non-national goalkeepers, when historically the Spanish goalkeeper was always a prestigious and talented goalkeeper.
"Now there are few, it is hard to find a keeper."
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