Roy Hodgson admits signing a striker is Crystal Palace's top priority during the January transfer window.
The Eagles laboured to a 1-0 victory over Sky Bet League Two opponents Grimsby, who had Andrew Fox sent off in the second minute of their FA Cup third-round tie at Selhurst Park.
Thirty attempts at goal followed before substitute Jordan Ayew emphatically headed in Jeffrey Schlupp's cross with only three minutes of regular time remaining and Hodgson views the failure to capitalise on so many chances as further evidence that Palace are lacking a finisher.
"Getting a striker is obviously something we would like because as we've seen once again, we can't do much more in terms of dominating games," Hodgson said.
"It's pretty obvious that if we had that person who score goals from nothing, or scores goals from half-chances, we'd be a lot higher up the Premier League and would have won our FA Cup game a lot earlier.
"It's early days in the transfer window and everybody knows this is a tough transfer window because clubs aren't eager to let players go if they're good enough.
"You're looking for the rare pearl - someone who is good enough who will make us better who at the same time for some reason is being released by their club."