The highly rated 23-year-old has earned a new contract, which runs until summer 2017, after impressing in both the PRO12 and the European Rugby Champions Cup for the Ospreys this season.
Wing Grabham came through the ranks at his home region, graduating as a scrum half from Tondu RFC to the senior squad at the Ospreys via Bridgend District, the Eyasses and Bridgend Ravens.
He made his regional debut in an LV= Cup defeat to Exeter Chiefs in October 2011 and he has gone on to feature 34 times for the Ospreys, scoring five tries, with 15 of his appearances coming this season. He has also gained international experience with Wales, captaining his country on the IRB Sevens World Series.
Grabham said: “I’m really pleased to sign for another two years. The Ospreys is my home region and I’m looking forward to the future.The main goal for me over the next two years is just to pull on the jersey as much as I can. It’s a competitive environment here and when you get the chance you’ve got to take it or you’ll find yourself out of the side.
“It’s an exciting time for the Ospreys, we are a young team but we’re ambitious about what we can achieve over the next few seasons and I’m happy that I’ll be a part of it.”
Grabham follows Joe Bearman in committing his future to the Ospreys this week, after Jeff Hassler, Tyler Ardron and Justin Tipuric signed new contracts earlier this season. The Ospreys have also confirmed the return of Wales prop, Paul James, and the capture of former All Black scrum half, Brendon Leonard, both of whom will join up with the region next season.