Swansea, currently 13th in the table on 43 points, beat Liverpool 3-1 on Sunday to secure their Premier League status for another season and Guidolin said Williams had earned a well-deserved rest.
"Ash will not play again this season, he needs a break," the manager told reporters. "He is tired because he has played a lot of games this season and before.
"Ash is the skipper, a good player and leader, and he is very important for me and our team. But it is better for Ash to rest and be prepared for the Euros and for next season."
The June 10-July 10 tournament in France is Wales' first major international championship since 1958. The team have been drawn with Russia, Slovakia and England in Group B and start their campaign against the Slovaks in Bordeaux on June 11.
Swansea travel to sixth-placed West Ham United on Saturday, before ending their campaign with a home game against Manchester City on May 15.
(Reporting by Nivedita Shankar in Bengaluru; Editing by John O'Brien)
Share
