They are expected to receive run-outs during this evening's second-string friendly (7.15pm).
Neither player has featured in the club's senior pre-season schedule and both were omitted from Leeds' recent tour of Slovakia but Michalik and Robinson will add strength to a United line-up tonight which should feature several experienced professionals.
Right-back Jason Crowe, who suffered a foot injury earlier in the summer, is due to play and both goalkeeper Alan Martin and striker Davide Somma will also be involved.