"I am delighted that he is still here, hopefully we will hang on to him and he will be the main man that gets us up," says Rob.
"He is a fantastic talent and you can run out of things to say about Jermain - from what I have seen of him he is up there with the best already and he is very young."
Jermain's frustration in Saturday's stalemate with Sheffield United was visible but Rob says: "He wants to score. Ian Wright used to have a right old moan and a whinge if he didn't get the right passes, and Jermain wants to do well for the club so I have no problem about that - it is part and parcel of it.
"The service to him was poor on Saturday but he still created three of four chances out of nothing on his own."
Rob is sure that Jermain will stay at Upton Park and he adds: "The vibes that are coming from the club are that they have sold all they need to sell so I'd be very surprised if he left."
As for the Carling Cup draw pairing the Hammers with an away trip to Cardiff, Rob adds: "Cardiff will be a very difficult place to go - it is a long trip against a decent home team."
More immediately is the trip to Rotherham, and Rob says: "Rotherham is not the most glamorous place to go but we have got to get used to these places and if we defend the way we did on Saturday and keep a clean sheet there are not going to be too many teams that stop us scoring."