During the chanting of tiruppavai can we chant manthras of mangalshasanam?

As per the rituals, Mangalasaasanam should be chanted seperately at the end. Otherwise, it can be chanted seperately after an interval. For any Manthra slokham or Vedic recital should always be at the end or on completion of Thiruppavai only. This is just only to give concurrence to the paasurams. This has been practiced at many a places.