Singapore government-owned PSA is understood to have enlisted Tulchan founder Andrew Grant and consultant David Trenchard ahead of P&O's announcement this week that it had been approached by the firm.
PSA is considering an offer that values P&O at £3.5bn. This would trump the £3.3bn recommended offer made by Dubai government-owned DP World.
DP World brought in Bell Pottinger Corporate & Financial for the bid towards the end of last year. P&O retains Brunswick.
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