LHCb will collect very large samples of B-mesons decaying to charmless two-body final 
states. The combined measurement of the B^0 -> pi^+ pi^- and B^0_s -> K^+K^- time-dependent 
CP asymmetries allows to determine the Unitarity Triangle angle gamma, up to U-spin flavour 
symmetry breaking corrections.

We present the status of the LHCb analysis of the charged two-body charmless modes, 
outlining the event selection, trigger, tagging, particle ID performance and proper time 
resolution. A study of the LHCb sensitivity on the direct and mixing-induced CP-violating 
parameters A_{CP}^{dir} and A_{CP}^{mix} is then performed, and the final LHCb sensitivity 
to the gamma angle measurement using these decay modes is estimated.