RALPH Hasenhuttl revealed Saints “have to work” with frontman Armando Broja and insisted he was “not invested enough” in the game at Sheffield United.

The Albanian striker, on loan from Chelsea, had scored twice in the previous round’s 8-0 success at Newport County.

But having started on his own up front at Bramall Lane, the 20-year-old failed to find the target in the 2-2 draw - and also saw his penalty saved in the resulting shootout.

Broja has made three substitute appearances in the Premier league this season, coming on in games against West Ham, Newcastle and Manchester City.

Asked whether the clash with the Blades felt like a missed opportunity for the striker, Hasenhuttl replied: “It was not so easy, especially against a Championship team.

“At first you have to work to fight in the game and this was for me a little bit a problem on Tuesday for him.

“He is not invested enough I think in the game and then it us tough to fly in the game like this. This is what he has to learn.

“He has some qualities, we could see in some moments there is quality there but we must also work much more for getting in the right positions – then he is strong.

“We have to work with him. I said it once, a young player with potential but there’s still a lot of things to learn.”

Broja came through the youth ranks at Chelsea and signed a fresh five-year contract at Stamford Bridge before joining Saints on a season-long deal this summer.

He spent last season on loan Eredivisie outfit Vitesse Arnhem, where he made 34 appearances and scored 11 goals.