The 23-year-old has agreed a one-year deal at Spotland, subject to Football League clearance.
Mendez-Laing left Peterborough earlier this summer after spending the last three months of last season on loan at Cambridge United.
Rochdale have now brought in four new players ahead of next Tuesday's transfer deadline, with Lewis Alessandra, Donal McDermott and Jim McNulty also being recruited.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Forest Green RoversForest Green | 15 | 9 | 4 | 2 | 27 | 13 | 14 | 31 |
| 2 | Port Vale | 15 | 8 | 4 | 3 | 27 | 15 | 12 | 28 |
| 3 | Northampton TownNorthampton | 15 | 8 | 3 | 4 | 20 | 11 | 9 | 27 |
| 4 | Exeter CityExeter | 15 | 6 | 8 | 1 | 25 | 15 | 10 | 26 |
| 5 | Swindon TownSwindon | 15 | 7 | 5 | 3 | 22 | 15 | 7 | 26 |
| 6 | Leyton Orient | 15 | 5 | 8 | 2 | 25 | 12 | 13 | 23 |
| 7 | Harrogate TownHarrogate | 15 | 6 | 5 | 4 | 27 | 20 | 7 | 23 |
| 8 | Newport CountyNewport | 15 | 6 | 5 | 4 | 25 | 18 | 7 | 23 |
| 9 | Sutton UnitedSutton | 15 | 7 | 2 | 6 | 23 | 18 | 5 | 23 |
| 10 | Hartlepool UnitedHartlepool | 15 | 7 | 2 | 6 | 17 | 20 | -3 | 23 |
| 11 | Tranmere RoversTranmere | 15 | 6 | 4 | 5 | 11 | 10 | 1 | 22 |
| 12 | Bradford CityBradford | 15 | 5 | 6 | 4 | 21 | 18 | 3 | 21 |
| 13 | Rochdale | 15 | 5 | 5 | 5 | 19 | 19 | 0 | 20 |
| 14 | Walsall | 15 | 5 | 5 | 5 | 19 | 19 | 0 | 20 |
| 15 | Barrow | 15 | 4 | 6 | 5 | 20 | 20 | 0 | 18 |
| 16 | Bristol Rovers | 15 | 5 | 3 | 7 | 17 | 23 | -6 | 18 |
| 17 | Colchester UnitedColchester | 15 | 4 | 5 | 6 | 12 | 19 | -7 | 17 |
| 18 | Crawley TownCrawley | 15 | 5 | 2 | 8 | 17 | 25 | -8 | 17 |
| 19 | Salford City | 15 | 4 | 4 | 7 | 16 | 17 | -1 | 16 |
| 20 | Mansfield TownMansfield | 15 | 3 | 5 | 7 | 14 | 20 | -6 | 14 |
| 21 | Stevenage | 15 | 3 | 5 | 7 | 11 | 26 | -15 | 14 |
| 22 | Oldham AthleticOldham | 15 | 3 | 3 | 9 | 11 | 22 | -11 | 12 |
| 23 | Carlisle UnitedCarlisle | 15 | 2 | 6 | 7 | 11 | 24 | -13 | 12 |
| 24 | Scunthorpe UnitedScunthorpe | 15 | 2 | 5 | 8 | 11 | 29 | -18 | 11 |
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