Southampton won't accept offers for forward Jay Rodriguez or midfielder Morgan Schneiderlin this summer.
Everton forward Kevin Mirallas has hinted that he will sign a new contract at Goodison Park in the summer.
On Wednesday night the Dons stopper made his third appearance in a row - in a 2-1 defeat by Hibernian - as he continued his comeback after suffering a brain haemorrhage last summer.
The end of the season may be coming at the wrong time for the fit-again goalkeeper but Langfield says his decision to remain at Pittodrie was made for footballing reasons.
He said: "It was a big decision and I'm delighted. I knew a month ago the club had offered me a new deal.
"It was all about playing football again as I have come through a lot this year. I have worked my backside off to get back fit and get over my illness.
"It was great to get the offer and, as I said to the manager, it was just down to footballing reasons.
"Things obviously haven't went right the past two games but I feel like I'm finding my feet again and I'm thoroughly enjoying it.
"I could have gambled and tried my luck elsewhere. There was interest but my main focus was on getting back playing.
"I said that to the manager and to get offered a two-year contract was great. That will take my up to my ninth year at the club so I'm really happy and hopefully I can give a lot more than I gave this season."
Langfield admitted the Dons have to cut out their defensive mistakes after they slumped to a home defeat at the hands of Hibs and a sixth loss in eight matches.
He added: "If you start a match the way we started then it is always going to be an uphill task - especially at home. We didn't get going at all in the first half and lost two silly goals. We did play better in the second half but it was too late by then."
The win for Hibernian moves them five points above bottom of the league Dunfermline with two games remaining and manager Pat Fenlon is confident his side can confirm their Clydesdale Bank Premier League safety when they meet the Pars at Easter Road on Monday.
He added: "I said the other day that I expected us to see it out. We are under no illusions. We know Dunfermline are going to come at us on Monday and have a right go.
"We have to stand up to that. We will be at home and I'm expecting a big crowd.
"We will go out to win the match. We haven't gone into any game playing for a point.
"There are a few where we would have taken a point but we will go and try to win the game like we always do."