The 24-year-old Senegal international has impressed for the Hammers so far this season, scoring one goal in two appearances.
Sakho now hopes to go on and make a further impact at Upton Park for the remainder of the campaign.
"It's only been a couple of weeks but I feel right at home already," he told the club's official website. "I want to achieve things with West Ham and lots of them.
"I am super motivated and I'm going to give all that I possibly can to help the team. I feel good at the minute with everyone around me doing their utmost to see that I'm in the best shape possible."
West Ham are back in Premier League action on Monday when they make the trip to Hull City.