Chapman had two spells as Wolves manager in the 1980s.
Ayling has joined Kemar Roofe on the sidelines just over a week ahead of the start of the new Championship season.
The Champions League winners have made an application to the Intellectual Property Office.
The Bosnian fought off masked men who confronted the players in north-west London.
The defender has been troubled by a chronic knee injury.
The Blades have also announced the arrival of Ben Osborn from Nottingham Forest.
Sports Direct branded ‘total shambles’ over latest delay to publish results
The veteran defender is available on a free transfer.
Midfielder Osborn joins Blades. The 24-year-old has signed for an undisclosed fee.
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