Jack Butland is close to joining Manchester United.
The 29-year-old is expected to have a medical in the next 24 hours and join the club on a loan until the end of the next season.
Butland's wages will be paid in full for the time he is at Old Manchester.
Butland, who was part of England's World Cup squad, is yet to make an appearance for the Eagles this season and is thought to be interested in moving to United.
Tom Heaton is the club's second-choice keeper, with the 36-year-old named on the bench for Tuesday night's win over Bournemouth.
If De Gea signs a new deal, any move for Sommer, who is 34 years old, would be out of the question.
The Spanish player wants to stay at Manchester United for the rest of his career.
The 32-year-old's current deal runs out at the end of the season, with United holding the option of a one-year extension, but there have been talks over a longer term contract.
When questioned about his contract situation, De Gea said he was very relaxed. I focus on training and performing as best as possible. It's going to end well.
I would like to stay for the rest of my life. It's a huge honor to be here, I've been here many, many years, and I'm so happy here.
In Tuesday night's win over Bournemouth, De Gea made key saves from Philip Billing and Jaidon Anthony to keep the score at 2-0 before MarcusRashford got United's third.
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Another clean sheet means that United have not conceded at home in the league since September, a record which will be tested when Manchester City visit on January 14.
"It should be a tough place for the teams, let's see in the future," De Gea said.
We are playing well, we have to keep the energy up and prepare for every game as if it's a final. We play a lot of games this month, so we have to recover quickly.
Since they began the season with back-to-back defeats, United's defensive record has been important.
"We were talking, everyone is ready, everyone is focused, everyone is in the same direction, so this is massive," De Gea said.
It's not important who is playing. The players play in this way because they have great team spirit and they put everything on the pitch.
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On Tuesday, United remained in fourth place despite the fact that they were tied with the Magpies and one behind City.
Their form is a match for anyone with 13 wins from the last 16 in all competition.
De Gea said that he was doing well. We feel like a proper team because he puts everyone in the same direction. Everyone wants to play for this club.
"He brought a great spirit to the team, we are playing well and this is how we have to show and keep the momentum as well."
The manager's verdict on what proved to be a comfortable victory was revealed by De Gea.
He was happy with the clean sheet, but he was angry because we conceded too many chances. He was upset because we were too open at the end of the game.