It is permissible to perform the fasts of Monday or Thursday along with a make-up fast. (al-Fatawa al-Kubra al-Fiqhiyyah v. 2, p. 90)
And Allah knows best.
Shafiifiqh.com Fatwa Dept.
Can’t find the answer you’re looking for? Submit your question here, and our experts will guide you with authentic Shafi’i fiqh knowledge.