David Moyes believes he could have challenged for the Premier League title at Everton if the club had been able to sign a centre-forward in his last couple of years.
Moyes, who spent over 10 years in charge at Goodison Park between March 2002 and June 2013, is preparing to face his former side as Sunderland manager for the first time.
The Scot's best performance as Toffees' manager was a fourth place finish in 2004-05 and led them to seventh and sixth in his final two campaigns.
"We had a great team at Goodison but we were missing a centre-forward.