1)i guess , sameer told nanu about bet fiasco . nanu knows Sameer so well . so he knows by now that Sameer is in love wid naina . as nanu also likes naina , he will help Sameer to patch up wid naina .
2)in that case after hospital Arjun incident , may be nanu , as a trustee will give a punishment to Sameer will be sent to naina's house to take care of injured Arjun .
or
3)may be Sameer will be send to help in puja's marriage , as injured arjun's help is missing in the house and need extra hand to help.
4) may be as a nanu's business employer ,Sameer to work at Agarwal house , like smeone suggested wedding planner .
5) may b nanu will use his business contact to send Sameer as their employer to naina's house .