Tottenham head coach Andre Villas-Boas has admitted that Jermain Defoe and Roberto Soldado are playing for one place in his starting line-up.
Defoe, 30, has not started a game in the Premier League this season but took his Europa League tally to four with two goals in the 3-0 win over Tromso.
Soldado has started each of Spurs' four Premier League games.
"JD is doing well. He and Soldado are competing and all of their performances have been excellent," Villas-Boas said.
"There is not one single negative thing I can say about the performances of Soldado and JD. At the moment we are playing with one striker up front and a number 10.
"We've scored 15 goals in seven games and conceded one, which are good numbers for us, so we haven't yet seen a reason to change to 4-4-2 but that is definitely an option for the future."
Defoe has said he is not happy being on the substitutes' bench but will fight for his place at White Hart Lane.
He told ITV4: "The manager knows [what I can do]. It's a case of getting out there and working hard for the team.
"This is a top club with top players and when you get an opportunity you have to take it."
Villas-Boas added that of the injuries picked up by defenders Danny Rose and Younes Kaboul and midfielder Moussa Dembele, Rose's was the most serious.
Left-back Rose limped out of the Europa League victory with an ankle problem and is doubtful for Sunday's trip to Cardiff.
Dembele was carried off following a heavy challenge and Kaboul suffered an adductor injury late on.
Villas-Boas said: "Dembele should be OK. He felt a lot of pain when he was brought down, but now he's steady.
"Younes felt muscle tightness in his adductor and we decided to take him off. He was struggling but he didn't rupture anything.
"We have to be a little bit more careful with Danny. We hope it's not serious. He is in doubt for Sunday but he should be OK."