New Zealand international Young, who returns following a three-match stint at the end of 2025, will be available for the remaining six fixtures of the County Championship.
Indian international Suthar, who impressed across two games earlier in this year’s campaign, will be back for the final four games of the season after he was named in India’s 15-player squad for their two-Test series against Sri Lanka in August.
Both players join with the Bears five points off top spot in Division One and well-placed to challenge for a first title since 2021.
Young brings a wealth of experience playing international cricket for the Black Caps, scoring over 3,000 runs for New Zealand across formats since making his debut in 2020.
The 33-year-old has recorded 11 50s in Test matches, scoring 1,200 runs, while amassing over 8,700 runs in First Class cricket including 16 100s and 52 50s across 143 matches.
Across three games for Warwickshire last year, Young averaged 53 with a high score of 72 which came in his first innings for the Club in a draw against Surrey.
Suthar, a left arm finger-spinning all-rounder, impressed during a two-game spell earlier this season, taking 11 wickets which included a maiden five-fer for the Club.
Earlier this year, he made his Test debut for India and was named man of the match after recording figures of six for 33 in the first innings of their comprehensive victory over Afghanistan.
The 23-year-old returns to the Bears having taken 147 wickets in 32 First-Class matches.
Warwickshire Performance Director, James Thomas, said: “We’re very pleased to welcome both Will and Manav back to the Bears after both players made a real impact when they were last with the Club.
“We’ve played some good red-ball cricket already this season, and both players will now bring additional quality at a crucial time of the campaign where we are in the mix for the title.
“Will adds experience to our batting line-up, especially with Beau Webster’s time at the Club over for the season, while Manav showed earlier this year that he has the ability to change a game with the ball as well as adding crucial runs.”