The forwards played together for only the second time since Pitman's return to the club last month, in Saturday's win over Colchester.
Despite the huge competition for places in attack, Howe believes he has seen enough to suggest that they could form a formidable partnership.
"Both players have done great for us so far this season and hopefully there are more goals to come from them," he told the club's official website.
"The strength in the partnership is the different attributes they possess. Grabbs (Grabban) has athleticism and Brett likes to get into pockets of space, but they are both good finishers and that is something you always want.
"There is always pressure on them to perform and that is the beauty of the strikers we have here. We have proven strikers waiting for their chance and having that sort of competition for places can only be good."