The fund manager's London-based chief executive and chief investment officer, Bruno Crastes, global fixed income head Vincent Chailley and deputy chief executive Jean-Noel Alba had all resigned, Standard & Poor's (S&P) Fund Services said.
S&P Fund Services revised its four-stars rating on the Amundi product, while Zenith and Morningstar put the fund under review.
"S&P has placed the fund on hold as the departing members were fundamental to the fund's portfolio positioning," S&P fund analyst Anthony Karaminas said.
Zenith, which previously rated the fund as recommended, put the product under review citing Crastes' and Chailley's seniority.
"While there is significant depth within the team, we feel there is sufficient uncertainty to warrant placing the fund under review," Zenith investment analyst Steve Tang said.
Zenith was concerned the team that was selected by Crastes might follow him to a new employer, Tang said.
Morningstar's recommendation on Amundi was currently under review, Morningstar research analyst Tim Wong said.
Amundi Asset Management Australia chief executive Richard Borysiewicz was unavailable for comment.
The Amundi Global Diversified Fixed Interest Fund was previously known as the Credit Agricole Asset Management Global Bond Fund.
