Posh are still waiting on defender Craig Morgan ahead of the Rovers game following his toe injury.
Palmi Palmason broke free in the box but his low shot was blocked thanks to Craig Morgan's timely last-ditch challenge.
During the rearguard action goalscorer Collins fell awkwardly and was forced to limp off a minute before half-time, to be replaced by Craig Morgan.
Zakuani has missed the past two matches with a thigh strain and could replace either Craig Morgan or Ryan Bennett in the back four.
Craig Morgan and Mark Jones are the only recognised specialist wings in Hansen's squad, with James' Bridgend colleague Gareth Thomas added as "utility" cover.
Ryan Bennett, Scott Griffiths and Exodus Geohaghon are all set to miss out in defence, but Gabby Zakuani is fit to play alongside Craig Morgan.
With both Gabby Zakuani and Charlie Lee unavailable, Ryan Bennett filled in a right-back with Craig Morgan coming in alongside Exodus Geohaghon in the centre.
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The hosts were never in it after Craig Morgan saw red for a lunge at Campbell, and Ryan Bennett was then sent off for a professional foul on the same player.
Rob Howley brilliantly reclaimed his own kick ahead and the ball was spread left for wing Craig Morgan, who had an earlier score disallowed for offside, to race in at the flag.
The defence were caught sleeping which allowed the lively Joel Kitenge to break free and level striking from 20 yards which took a deflection off Craig Morgan before going in off the crossbar.
Three minutes later referee Paul Adams inadvertently obstructed a would-be tackler allowing Howley to dart from a scrum and spark a move which climaxed in a long pass by fly-half Paul Burke for left wing Craig Morgan to score.
During the year they hit 12 sixes but three of those came from the discarded Craig Kieswetter and the injured Eoin Morgan.
Investment banks participating in the deal include Goldman Sachs, Morgan Stanley, Deutsche Bank, Needham, Oppenheiner, William Blair and Craig-Halum.
Craig Kieswetter and Michael Lumb have proved an inspired opening combination, with Kevin Pietersen and Eoin Morgan both in imperious form in the middle order.
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