David Healy is training hard in a bid to improve his performance ahead of Northern Ireland's World Cup qualifier against the Czech Republic.
The Sunderland striker was disappointed with the 2-1 defeat at the hands of Slovakia and wants to raise his game in time for the match at Windsor Park.
Manager Nigel Worthington said: "I think David feels his sharpness is not up to speed. He has not played as much football pre-season as he would have done in the past.
"I have had a word with him and told him just to keep his head up. Frustration happens in sport and he has got to deal with it."
Healy has been training long hours in preparation for the match and it has not gone unnoticed by Worthington.
He said: "I was on a bike and in walked David at half past seven. I had to look twice to see if it was him.
"That said to me he was disappointed about the Slovakia game and he wanted to do something about it."
Worthington thinks the Czech Republic clash will be a tough test for his side but hopes the night-time schedule will work to their advantage.
He said: "The atmosphere at night is far superior. Even though the crowd is about the same there is just something different about the darkness and the support that make it different.
"We are at home and we have got to go for it, starting against the Czech Republic."