On 7 March 2016, it was announced that Jeffrey had been appointed the new manager of Ballymena United, following the sacking of Glenn Ferguson.
ˌɔn sˈɛvən mˈɑːɹtʃ tˈuː θˈaʊzənd sˈɪkstiːn, ɪt wʌz ɐnˈaʊnst ðæt dʒˈɛfɹi hɐdbɪn ɐpˈɔɪntᵻd ðə nˈuː mˈænɪdʒɚɹ ʌv bˌælɪmˈiːnə juːnˈaɪɾᵻd, fˈɑːloʊɪŋ ðə sˈækɪŋ ʌv ɡlˈɛn fˈɜːɡəsən.