Steffen Freund accepts Emmanuel Adebayor has not been happy this season, but insists the striker will have a role to play for Tottenham Hotspur.
Adebayor impressed on loan at White Hart Lane last term, but has been unable to make an impact since rejoining Spurs permanently from Manchester City in the summer.
He has made just four substitute appearances, all at home, and has been struggling with back and hamstring injuries since his move.
The 28-year-old was not involved in Sunday's win at Southampton and he remains a doubt for Wednesday's Capital One Cup tie at Norwich City due to a stomach bug.
However, while assistant boss Freund understands Adebayor's frustration, he is adamant the Togo forward is an important part of Andre Villas-Boas' plans.
"Adebayor is sick today," said Freund. "We will have a look tomorrow (to see if he is fit for Norwich).
"If you're not playing and you're injured then of course you are not happy.
"He's really sick but hopefully he will be back in time. He is one of the best strikers in the Premier League. We are happy to have him back here.
"We need every Tottenham Hotspur player. If Andre wants to rotate or change the position up front, it's good to have every player fit."