Vidal Nuno gave up four runs in 3 1/3 innings Thursday in his emergency start against the Tigers.
Mariners manager Scott Servais said Saturday that Vidal Nuno will enter spring camp as a reliever.
Vidal Nuno took a no-decision in his final start of the season, yielding two runs over six innings as the Mariners eked out a win over the Athletics on Sunday.
Vidal Nuno went five innings and gave up three runs, taking a no-decision in Tuesday's win over the Astros.
Vidal Nuno will start Tuesday against the Astros.
Vidal Nuno poured in a strong start in Wednesday's 6-0 win over the Rangers, striking out 10 while allowing one hit and no runs over seven innings.
Vidal Nuno will make another spot start for the Mariners on Wednesday against the Rangers.
Vidal Nuno lost to the Astros on Monday after yielding five runs in six innings.
Vidal Nuno will start for the Mariners on Monday in place of Felix Hernandez.
Vidal Nuno pitched 6 2/3 innings of one-run ball in a no-decision versus the White Sox on Saturday.
Vidal Nuno lasted only 4 1/3 innings versus the Red Sox, allowing four runs in a no-decision as the Mariners won in 12 innings.
Vidal Nuno gave up only two runs in five innings but lost to the Orioles on Monday.
Mariners manager Lloyd McClendon said Wednesday that Vidal Nuno will receive at least one more start.
Vidal Nuno gave up three runs over 3 2/3 innings in a no-decision against the Rockies on Tuesday.