Inclusion Criteria:  Age ≥ 18 years; Anterior STEMI (e.g., ST elevation above the J-point of ≥0.1 millivolt in ≥two contiguous leads or left bundle branch block) or very high-risk NSTEMI (e.g., dynamic ECG changes or ongoing chest pain or acute heart failure or hemodynamic instability independent of ECG changes or life-threatening ventricular arrhythmias) with echographic evidence of anterior wall motion abnormalities and, with a culprit lesion of the proximal or mid portion of the left anterior descending (LAD) on the coronary angiography; No contraindication to CMR (e.g., claustrophobia, pacemaker or defibrillator not compatible); Ability to provide written informed consent and willing to participate in 1-month follow-up period. Affiliation of social security regime.  Exclusion Criteria:  Patients with cardiogenic shock (systolic blood pressure <90 mmHg with clinical signs of low output or patients requiring inotropic agents); Patients referred to surgery for coronary artery bypass grafting (CABG) or treatment of acute complications (e.g. ventricular septal rupture); Patients treated with fibrinolytic therapy; LV thrombus diagnosed before randomization using a transthoracic echocardiography; Active major bleeding or major surgery within the last 30 days;High bleeding risk (patients considered at increased risk of bleeding during DAPT; e.g. PRECISE-DAPT score >25; severe liver failure or Child Pugh class C); Known history of intracranial hemorrhagic stroke or intra-cranial aneurysm; Known history of peptic ulcer; Known stroke (any type) within the last 30 days; Known intolerance to aspirin, P2Y12 inhibitors, rivaroxaban and their excipients; Patients with presence of malignant neoplasms at high risk of bleeding Patients with hepatic impairment According to the SmPC any contraindication to rivaroxaban, aspirin, clopidogrel, ticagrelor Known intolerance to gadolinium chelates; Chronic kidney disease (creatinine clearance (ClCr) <30 mL/min); Indication for anticoagulation (e.g. atrial fibrillation, mechanical valves, LV thrombus…); Life expectancy <1 month; Known pregnancy at time of randomization (pregnancy test done) or breastfeeding women; Currently participating in another trial Protected adults (including individual under guardianship by court order) Persons deprived of their liberty by judicial or administrative decision