Jose Mourinho admits it is "difficult" to know how to instil the missing killer instinct that continues to hamper Manchester United.
Comfort made way for frustration as Thursday's Europa League quarter-final first leg at Anderlecht came to a close - an all too familiar theme during the Portuguese's first season at Old Trafford.
Henrikh Mkhitaryan put United on course for a deserved victory at the Constant Vanden Stock Stadium, yet an inability to turn dominance into goals saw them caught cold by Leander Dendoncker's late header.
While United's away goal in the 1-1 draw could prove decisive, a 14th draw of the campaign in all competitions clearly irked Mourinho.