Question:
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Silva, 39, was appointed until the end of the season on Thursday after Mike Phelan's sacking, with Hull bottom of the table on 13 points from 20 games.
"I have confidence in our players, but it's clear we need to improve our roster," said the Portuguese.
Hull host fellow strugglers Swansea in the FA Cup third round on Saturday.
"They say you need a lot of luck, you need a miracle to remain in the Premier League," added Silva.
"It's normal to say this, but sometimes miracles happen - maybe in May the miracle will happen. We'll see."
After Saturday's match with Swansea, the Tigers face Manchester United in the EFL Cup semi-final on 10 January before resuming league duties against Bournemouth on 14 January.
The club also rejected a bid from West Ham for top-scorer Robert Snodgrass on Friday, and made permanent midfielder Markus Henriksen's loan move from AZ Alkmaar.

Summarize the main points of that article.
Answer:
New boss Marco Silva says Hull City need to strengthen their squad in January to perform the "miracle" of staying in the Premier League.
input: Article: The uncapped Williams, 24, was being touted for a possible openside role by England head coach Eddie Jones, but will now be out for up to three months.
James Haskell, Jack Clifford and Sam Jones were already on the injured list.
"It's bitterly disappointing with England on the horizon," said Leicester director of rugby Richard Cockerill.
England start their autumn campaign against South Africa at Twickenham on 12 November.
Williams was injured during the warm-up before last Saturday's game against Worcester Warriors.
It was initially hoped he had suffered nerve damage and would be fit for the European Champions Cup game with Glasgow Warriors on Friday.
The Zimbabwe-born, England-qualified forward broke a bone in his forearm last December and then broke it again in January, meaning his season ended five months early.
"Unfortunately he's re-fractured his arm that he broke last year. It will heal in 8-12 weeks," Cockerill told BBC Radio Leicester.
"It's the same arm and fracture site. Historically, these things are notoriously difficult to clear up. They have a history of coming back. They are very difficult injuries to shake off.
"We have done all the right things and he has done everything he can do but it is purely bad luck."

Summarize.
output: England have lost another flanker for the autumn series after it was confirmed Mike Williams has broken his arm for the third time in 12 months.
South Wales Police are investigating how a silver Ford Ka collided with a tree on Neath Road, Tonna, at about 03:30 GMT on Tuesday.
A 20-year-old man has been arrested on suspicion of causing serious injury by dangerous driving.
A girl, 15, is in a serious but stable condition and a man, 21, has non life-threatening injuries.
A 20-year-old man and 17-year-old girl, were discharged from hospital on Tuesday.
Police want to hear from anyone who witnessed the collision or saw the car in the area before the crash.

Sum:
Two people remain in hospital following a crash which left four hurt in Neath Port Talbot.