Hughes added that Bellamy would have to completely rest for two weeks before returning for strength work.
Since moving from West Ham in the January transfer window Bellamy has scored five goals in 10 starts before tearing a patella tendon in his knee in the league game with the Hammers in March.
The improved fitness of Bulgarian Valeri Bojinov was some welcome news for City.
The forward is set to play for the reserves at Middlesbrough on Tuesday after snapping his Achilles tendon last August.
Winger Shaun Wright-Phillips is still struggling with ankle damage that has resulted in him missing the last three games, while Hughes confirmed that a hamstring injury could rule Pablo Zabaleta out for a "number of games".
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