Despite improvements in acute care, ischemic heart disease remains the major cause of death worldwide. [1] For the treatment of heart infarction or heart failure, stem cell therapies have emerged as a therapeutic option. Although data from first clinical trials revealed promising safety profiles with moderate Although there are improvements in acute care, ischemic heart disease is the major cause of death worldwide. As a treatment for heart failure or heart infarction, stem cell therapies emerged as a potential therapeutic option. First results have shown moderate improvements and have revealed several limitations, such as an insufficient retention, homing, and engraftment of the cells. These drawbacks result in a loss of cells shortly after implantation. To overcome these hurdles, a human cardiac patch is developed in this work, using a biological collagen-based vascularized scaffold (BioVaSc ® ). Endothelial cells are cultured in the pre-existing vascular structure to establish a physiological blood-tissue interface. A co-culture of fibroblasts, mesenchymal stem cells, and induced-pluripotent-stem-cell-derived cardiomyocytes is seeded on the vascularized scaffold. After two weeks, physiological cardiac functions and expression of cardiac-specific markers is detected. Moreover, physiological beating rates as well as responsiveness to drug treatment and electrical stimulation is observed. Bioreactor culture facilitates long-term culture up to four months. Due to its tissue characteristics, the patch constitutes a promising tool for drug development, in addition to its potential in clinical applications.