The current standard of care for rehabilitation of patients with aphasia after stroke is conventional speech and language therapy (SLT). Due to economic realities on most stroke units, SLT can often not be given with optimal intensity in the first weeks after the stroke. Developing new adjuvant therapies which may render SLT sessions more effective is thus one approach to improve rehabilitation outcome. Recent functional imaging studies in post-stroke aphasia have shown that the recruitment of brain regions in the unaffected hemisphere seems to be an inferior strategy for recovery of language function as compared to re-activation of brain regions in the vicinity of the infarct. Non-invasive brain stimulation techniques, such as repetitive transcranial magnetic stimulation (rTMS) or transcranial direct current stimulation (tDCS) are new methods to modulate brain activity. Evidence from our own feasibility study in sub-acute stroke suggests that these new techniques, when applied in conjunction with conventional SLT, may help to normalize brain activation patterns and might yield better rehabilitation outcome than SLT alone. With NORTHSTAR, we propose a multicenter proof-of-concept study to investigate the safety, feasibility and efficacy of these new non-invasive brain stimulation methods as adjuvant therapies for subacute post-stroke aphasia.