Head coach Derek McInnes believes his table-topping Hearts side have yet to hit top gear and still have plenty scope for improvement.

The Tynecastle club kept up their strong start to their Premiership campaign when Craig Halkett's stoppage-time goal secured a 1-0 home win over Edinburgh rivals Hibernian.

Despite sitting two points clear of champions Celtic with six wins and a draw from their seven matches so far, including a 3-0 victory over Falkirk, McInnes hopes his side won't get carried away with their success.

"We have been good enough so far to win games," the Hearts boss said.

"But you have to be honest, a lot of the games have been tight. We're not blowing teams away 4-0.

"This Scottish Premiership is so tight and there's not a lot between a lot of teams.

"If you can get back-to-back wins, never mind four, you can quickly make some hay with that and that's where we're at, so long may it continue. But we've got to recognise that we're going to have to keep improving.

"Everybody's so desperate for success at Hearts, but there's work to be done here.

"We were a bottom-six team last season and it's not just a flick of a switch that makes things better. We're not all that unless we continue to work and try to improve.

"We've got players to come back, we've got a few injured, we've got good players, so it shows you the depth we've got.

"I think we can get improvements from signings and from availability of players."