Blackman signed for Vitesse on deadline day in August, but has been recovering from knee surgery in London.
Now, reports De Gelderlander, Blackman has arrived in Arnhem as he prepares to train with Vitesse's first team squad. If he had remained in London, regulations would mean he could only work with the U23 and U18 squads.
Blackman is on a season-long loan at Vitesse and will continue his rehab in Holland with the aim to being available for selection in the New Year.
The 25 year-old's deal with Chelsea expires next summer.