Defeat away at Burton Albion on Wednesday night leaves the U's fate out of their own hands, a point adrift of safety and now needing other results to also go their way to stand any chance of staying in League One.
Relegations rivals MK Dons travel to Burton, while Morecambe are away at Exeter City.
Whatever happens in those two games will, though, count for nothing if Cambridge do not get the job done themselves by beating Forest Green.
The Abbey Stadium is sold out, while Rovers have offered free coach travel for away fans who face a seven-hour round trip on the journey across from Gloucestershire.
Bonner wants his players to just focus on their own performances rather than worry about what might be going on elsewhere.
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