GSTR3B and GSTR9

One Tax Payer has not filed GSTR3B for one year due to his personal problems. But his suppliers filed returns and paid the taxes. Subsequently, the tax payer filed GSTR9 and paid the taxes in DRC3. Now, my query is, how can he claim ITC (due to non filing of GSTR3b, auto population of ITC not reflected in GSTR 9.