The result leaves the Gunners four points adrift of the Blades.
Mikel Arteta says Arsenal "gave away two points" after a late goal from Sheffield United’s John Fleck cancelled out Gabriel Martinelli’s first half opener.
The Gunners were heading for a narrow win against the Blades but eventually played out a 1-1 draw at Emirates Stadium on Saturday.
Following the match, the Gunners boss said as Arsenal.com quoted: "I am very disappointed. We gave away two points.
"There is a history of giving away goals. In the Premier League when you're 1-0 up anything can happen.
"I think they all went full gas and tried really hard. Maybe in the first five minutes we tried to figure out the game but later they changed system and it was harder to control."
Arteta believes injuries to Kieran Tierney and Calum Chambers affected his side.
"When we analyse the opponent we can try to ask Ainsley and Bukayo a lot of things but they are not full-backs," Arteta added. "These things will happen."
The result leaves Arsenal four points adrift of the Blades as they continue to battle for a run of form.