Rio Ferdinand believes Manchester United striker Romelu Lukaku is struggling to deal with the added pressure of competing with Zlatan Ibrahimovic.

Lukaku began his United career with 11 goals in his first 10 games following a £75 million move from Everton in the summer, but the 24-year-old has scored just once in his last 11 appearances and missed a golden chance during the second half of the 4-2 win over Watford on Tuesday night.

Ibrahimovic returned from a seven-month layoff earlier this month and has made four substitute appearances as he works his way back to full fitness.

Former United defender Ferdinand has backed Lukaku to rediscover his goal-scoring form, but insists the Belgium international must first learn to live with the pressure of vying for a spot with Ibrahimovic.