The most obvious player that the Rangers need to give a contract extension to is their workhorse of a captain, McDonagh. His importance is extremely high. And of course, that means the team needs to lock him up when his contract expires in two years.
Since he started his career with the Rangers (when they practically stole him from the Canadiens), he has been excellent. His drive to win is admirably recognized by the entire team, and it makes a huge difference for the Rangers.
Although his attitude is important, it has to be remembered that he did something great for the Rangers this offseason without even meaning to. Newly acquired (and highly sought-after) defenseman Kevin Shattenkirk has mentioned over and over again that McDonagh was a huge part of the reason he wanted to come to play for the Rangers.
But the most important thing McDonagh holds claim to is his impressive play. He’s a big part of the reason why the Rangers are still Stanley Cup contenders. They simply cannot let him get away.