Another poor pass from Shelvey enabled Victor Moses to put the visitors ahead just after the half-hour mark but Swansea bounced back through Michu in the 64th minute to grab a point in a much improved second half showing.
"I think it was a great performance in the second half after a very, very difficult first half," he told Sky Sports.
"We started great and it was perfect with the goal after a couple of minutes, but then unfortunately we gave away two goals, and even some easy balls we lost in midfield.
"We had to perform better in the second half and I really think the boys did an excellent job, and we had a very, very good second-half performance and we got the equaliser."
Swansea now sit 13th on the table after recording one win, Monday night's draw and two losses in their opening four Premier League fixtures.