Watford boss Walter Mazzarri believes his side need to improve their mentality despite claiming a hard-fought 2-1 victory over 10-man Burnley.
Jeff Hendrick's early dismissal proved to be the difference as Troy Deeney and January signing M'Baye Niang gave Watford a 2-0 lead at half-time.
Burnley fought back as Ashley Barnes netted from the penalty spot after Hornets defender Sebastian Prodl handled the ball in the box, but the hosts held on to claim successive wins in the Premier League for the first time since September, after also beating Arsenal on Tuesday.
Barnes scuffed a chance to claim an equaliser in stoppage time and, despite earning two wins in the space of five days, Mazzarri wants his side to hone their killer instinct.