Moyes rates 'Schillo' highly, having signed him on three different occasions at Everton - once on a permanent deal and twice on loan.
The former Manchester United boss has also made no secret of the fact he wants to bring in players with experience of playing in the Premier League - this is something the player can offer as he has played at the highest level in England for close to 10 years.
It appeared at one stage that the former Bafana Bafana international's career in the English top flight could be coming to an end - he struggled with injuries and only made 13 league appearances in the last couple of seasons.
Nonetheless, with it appearing more than likely that Moyes wants to add Pienaar to Sunderland's ranks for 2016/17, there seems to be a good chance 'Schillo' could feature against Dortmund.