Frank Lampard has explained his substitution of Nathan Patterson 45 minutes into his Everton debut.
The January transfer window signing from Rangers was taken off at half-time during Thursday night's FA Cup clash with non-league Boreham Wood at Goodison Park.
The change followed a first half in which Premier League Everton - who had lined-up with three centre-backs and Patterson and captain-for-the-night Vitalii Mykolenko at wing-backs - had failed to break through their National League opponents.
