Arsenal manager Arsene Wenger conceded his side were dominated by Championship side Nottingham Forest in their 4-2 FA Cup defeat on Sunday.
Forest dealt Wenger his first third-round elimination, with Eric Lichaj scoring twice before penalties from Ben Brereton and Kieran Dowell.
Per Mertesacker had levelled matters at 1-1 and Danny Welbeck's 79th-minute effort to make it 3-2 failed to spark a comeback from the defending champions.
"I believe that overall we played against a Nottingham team who were very sharp, more dangerous than us and dominated us at the front," Wenger told BT Sport.