Chris Wood has scored six goals in his 17 appearances since signing for Leeds United from Leicester City.
Wood was brought to Leeds from Leicester City during the summer transfer window, but he is yet to show his top form.
The New Zealand international has been subjected to criticism from sections of the Elland Road crowd, and Evans admits that the 23-year-old is currently short of his best.
“He’s done okay. I think he’s got to get himself a bit sharper, and we’re working on these things,” Evans said.
“When you come in you can’t always do these things quickly, and when the international break came he was off to Qatar for eight or nine days with his country.
“As much as I respect and love the fact that we have international players, there are times when you wish they were here.”
Wood is currently Leeds’ top scorer for the season, but his total of six goals in 17 appearances has not won over all of the fans at Leeds.
The powerful forward has struggled to make an impact in some matches, and he has also been guilty of squandering some big chances.
Evans has stuck by Wood during his time at Elland Road so far, though, and he has started the target-man in every match he has taken charge of to date.
Wood will be hoping to repay his manager’s faith in the coming weeks, with Leeds eager to start moving up the standings.
At the moment the Whites are perched in 16th place in the Championship table, and their next fixture comes against Queens Park Rangers on Saturday.