Siraj has a flaw in his action and that messes with his pace and rhythm, his foot collapses at the delivery point and he has not worked on it during all these years. Tyagi has an issue with his action, and that messes with his back and hence a history of injury and stop gap career.
These bowlers are a valuable asset but our bowler management and selections have been poor.
I would have Gurnoor, Shami, Bumrah, Ashok also bring in the left hander Naman Tiwari, Mayank and Umran along with Tyagi and rotate them, form a pool.