Roy Keane claims Manchester United got themselves a bargain by landing Romelu Lukaku at £75m. The Belgium international bagged his ninth and 10th goal since moving to Old Trafford from Everton in the summer in the away win at CSKA Moscow on Wednesday.

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United strolled to a 4-1 win against the Moscovian outfit as they took a giant leap towards the knock-out stages of Europe's elite club competition, with the club's former captain impressed by the huge progress made by Jose Mourinho's side this season.

The 24-year-old was the most expensive Premier League transfer over the summer, costing more than other big name strikers in Alvaro Morata and Alexandre Lacazette. But he is proving his worth, and United legend Keane believes that he was worth every penny.

"He is a good player at a good age. He knows the Premier League. He was a bargain at £75m, it was obvious he was going to score goals," Keane said on ITV's Champions League highlights show, as relayed by the Mirror.

Keane believes that Manchester United are ready to challenge for the Premier League title once again and suggested their in-form striker Romelu Lukaku is on course to hit 30 goals this season after his latest brace in the Champions League.

"His record at Everton was fantastic and clearly he has gone to a bigger club and better team, who will create so many chances for him, he will get 25-30 goals a season," he added.

"The big test will be in the big games. For all top United strikers over the years, has been scoring the big goals in the big games. It's crunch games when one goal will be the difference."

Keane has been highly critical of United in the four years since Alex Ferguson retired as the club's manager, but this is his most glowing endorsement yet of the team Mourinho is piecing together.

"United are back," declared ITV Sport pundit Keane. "They look like they could be ready to win the big trophies, whereas over the last year or two you look at them and thing they might win a League Cup or the so-called lesser trophies.

"They are back now competing and you would expect United to be in the latter stages of the Champions League and you would expect them to be competing to win the Premier League."