Hamilton's future at McLaren has been the subject of much speculation but Di Resta insists that he is fully focused on Force India despite being tipped to replace his fellow British driver after the current campaign.
"I don't hold the key to it," the Scot told Sky Sports News ahead of this weekend's Italian Grand Prix. "It's all talk up and down the paddock. Obviously there's a few key drives likely to change but I'm a Sahara Force India driver and I'll continue to do the work for them.
"It's media speculation as it normally is at Monza. It's nice to be in that framework but the important thing is keeping the focus on the race weekend.
"We're in the car tomorrow and we need to deliver 100% and that's what we'll try and do."
Di Resta is currently 13th in the World Championship.