Ambati Rayudu
Ambati Rayudu's ODI stats may not be much impressive but what matters is the recent run form. He scored 72 runs in the warm up game against Middlesex at Lord's which might favor his inclusion in the playing XI.
Though there are others who can replace him in 5th position. If Rahane doesn't open he might be dropped to 5th and replace Rayudu. Other than him, the latest entrant Sanju Samson who showed his worth in T20 cricket is also another option for Dhoni. But lack of experience for Samson may cost him the place.
Rayudu's domestic performance earned him a maiden call-up to the India ODI squad for their tour of Zimbabwe, where he scored a debut fifty.