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Sources said that Dhoni would be deciding about his retirement only after the surgery in London.
CSK needed 17 off the final over to qualify, but Dayal held his nerve despite being hit for a towering six by Dhoni off the first ball to seal it in the end for RCB.
RCB's sixth win on the trot also meant it was the end of the road for five-time champions CSK.
RCB beat Chennai by 27 runs to finish fourth in the IPL points table.
A washout will take CSK through to the playoffs, while RCB will need to win by at least 18 runs or chase the target with about 11 balls to spare.
'I hope he keeps going for another couple of years,' said the CSK batting coach.
RCB need to win their final game against Chennai Super Kings on Saturday at home and hope other results go their way.
CSK chased down a target of 142 with 10 balls to spare on a tricky surface.
The appeal was refereed to third umpire Anil Chaudhary who ruled that that Jadeja was watching the ball and deliberately changed direction.
Captain Gill made 104 off 55 while Sudharsan smashed a 51-ball 103
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