3rd round will be started today and i have seen that some of matches will be available today and mostly some of Premier league teams will fight against the teams from lower division and on the paper thiese matches shouldn't be big problem for them and here is the current schedules for 3rd round today

Walsall vs Leicester
Manchester City vs Watford
Chelsea vs FC Barrow
Wycombe vs Aston Villa

For the teams such as Manchester City, Aston Villa and Chelsea i am very confident these teams will be able to overcomes their opponents but for Leicester although their opponent is only the team from League One division but i highly doubt they can win because their performance is really unstable in Premier league even i was thinking possibility this match will be ended draw at the normal time