In August 1997 McGrain joined the backroom staff at Celtic, working under Wim Jansen.
Wim Wenders | Janine Jansen | Wim Delvoye | Wim Van Grembergen | Wim Kok | Wim Jansen | Steve Jansen | Floor Jansen | Cornelius Jansen | Wim Vandekeybus | Wim T. Schippers | Wim Sonneveld | Wim Crouwel | Tek Jansen | Rudolf Jansen | Marcell Jansen | Leo Jansen | Wim Verstappen | Wim van der Voort | Wim van der Linden | Wim van de Camp | Wim van Belleghem | Wim Thoelke | Wim Soetaert | Wim Naudé | Wim Klever | Wim Kieft | Wim Hof's | Wim Hofkens | Wim Hof |
Whether it is Coen Moulijn, Ruud Gullit, Wim Jansen, Willem van Hanegem, Johan Cruijff, Julio Ricardo Cruz, Pierre van Hooijdonk, Dirk Kuyt or John de Wolf, they have all been undergoing massages by Meijer in their way of rehability to perform at their best when needed.