Celtic manager Ronny Deila says there is more to come from Leigh Griffiths as he hailed the striker`s contribution to the team in recent weeks.
The Scotland international headed the second goal in Celtic`s 4-0 demolition of Motherwell on Wednesday to help his side move top of the Scottish Premiership.
The former Wolves and Hibernian forward appeared to be out of favour after the arrival of new boss Deila at Celtic Park in the summer and at one stage looked to be heading for the exit.
However, Griffiths has started the last two games for the Hoops and Deila has been impressed with the improvement the striker has made.
"Leigh`s played the last two games and we`ve won both of them. He`s played well and he`s improved on his position more than where he was three or four weeks ago," the Celtic manager said.
"I believe in him, he is an exciting player and his left-foot is world-class. He has the skills but you have to perform over time when you are at Celtic.
"There is big competition up front and it`s all about the opponents we meet, but Leigh has made an improvement in a lot of things. He looks much sharper now and he needs even more confidence, but the goal at Motherwell was very important.
"He has impressed me. We had some demands of him and he`s really worked hard to fit in. There are still things to improve, like everyone, but you saw against Motherwell how much he works for the team."
Next up for the Hoops as they continue their pursuit of a fourth league title in a row are Ross County.
The Staggies are bottom of the league and conceded five the last time Celtic made the visit to Victoria Park.
However, Jim McIntyre`s side held the Hoops to a goalless draw at Celtic Park at the end of December and Deila knows his side will have to work hard to create opportunities.
"We have to take one game at a time and now it is Ross County. I think there are going to be many similar things to our last game against them at Celtic Park," the Celtic boss said.
"I don`t think they`ll play so open like they did in the first game and that`s something we`ll have to cope with."
Celtic may find themselves playing catch-up on Saturday if Aberdeen can defeat St Johnstone in Friday night`s match at McDiarmid Park.
A win for the Dons would see Derek McInnes` side move two points above the Hoops at the top of the table as they aim to put the pressure back on the Glasgow giants.