Kammala jumla mai zuwa: Tare da aikinsa a Ostiraliya wanda rauni ya iyakance shi, Drinnen ya buga wasanni da yawa a matsayin kwararre ga Forfarshire a cikin Scottish National Cricket League (SNCL), kuma daga baya ya horar da kungiyar. A watan Disambar 2003, an nada shi darektan fasaha na Scottish Cricket Union (SCU), hukumar kula da wasan a Scotland. Drinnen ya yi aiki a wannan matsayi har zuwa watan Janairun 2006, lokacin da ya gaji Andy Moles a matsayin kocin kungiyar kwallon kafa ta Scotland. Ya horar da Scotland a
Kofin Duniya na 2007, tare da tawagar da ba ta yi nasara ba a gasar. Drinnen ya yi murabus daga wannan rawar a watan Yulin 2007, wanda ake zargin ba shi da farin jini a tsakanin wasu membobin tawagar. Ya koma aikinsa na baya a matsayin darektan fasaha, yayin da Andy Tennant da Peter Steindl suka karɓi tawagar a kan wucin gadi, tare da Steindl da ke ɗaukar matsayin dindindin daga Disamba 2007. An nada Drinnen a matsayin kocin Netherlands a watan Janairun 2008, ya maye gurbin tsohon babban kocin Peter Cantrell kuma ya maye gurbin mai koyar da Paul-Jan Bakker. Ya ci gaba da kasancewa a wannan matsayi har zuwa lokacin da ya yi murabus a watan Oktoba na 2013, bayan da ya horar da kungiyar a gasar cin kofin duniya ta 2009 da 2012, da kuma gasar cin kofin duniya ta 2011.