Can you tell what color cast is in this photo and...

How would you change it?

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Too much Magenta and therefore not enough Green to my eyes

I pushed the green +14 on shadows, highlights, and midtones.
My monitor is calibrated.

poloman's version looks dead on (on my calibrated monitor).

There are different ways to correct it. One way is to look at something that should to be white but is off color. In your picture I used the eyedropper tool and clicked on the white vest thing. (Sorry I don't know the proper name for it.) I then created a blank layer above the background layer and went to edit fill and filled it with the foreground color the eyedropper picked up from the vest. Then go to Image, adjustments, invert. Change the blending mode to color and reduce the opacity to around 50%. Add a hue/saturation layer and adjust the saturation up to around 35-50% to whatever you like.

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Mystyblue wrote in post #3455204
There are different ways to correct it. One way is to look at something that should to be white but is off color. In your picture I used the eyedropper tool and clicked on the white vest thing. (Sorry I don't know the proper name for it.) I then created a blank layer above the background layer and went to edit fill and filled it with the foreground color the eyedropper picked up from the vest. Then go to Image, adjustments, invert. Change the blending mode to color and reduce the opacity to around 50%. Add a hue/saturation layer and adjust the saturation up to around 35-50% to whatever you like.

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You can also use curves, select the middle (grey) eyedropper and click on something that should be neutral in the image.

Couldn't you just use the white dropper tool to choose the white balance based on the white player's undershirt?

To me the images needs little tweaking.
It is shot later in the day, when things warm up color wise anyway.

However, the highlights are heavy on yellow and the shadows are a little weighted to the red end of things.

I always place eye-dropper samplers on the "white" and "black" points in the image and use the numbers as a guide to color balancing.
Here are the numbers I worked with...
Black of right-front helemt = 4,3,2
White of left raised basket. = 252,249,243

I equate color balancing with flying a plane. Use IFR(instrument flight rules), to get things "right" by the numbers and flying to the airport on the right heading. Then switch to VFR(visusal flight rules) to bring her in for a landing.

In2Photos wrote in post #3455219
You can also use curves, select the middle (grey) eyedropper and click on something that should be neutral in the image.

That is what I tried first. I even used Dave Cross's trick for finding neutral grey to make sure I found the most neutral point but I wasn't happy with the results. I then tried one of Katrin's trick for removing color cast and was happy with that.

BillMarks wrote in post #3454881
poloman's version looks dead on (on my calibrated monitor).

LOL! I first read this as "poloman's version looks dead (on my calibrated monitor)"

I recovered after a brief "oh no!" moment.

Glad to see our monitors agree!

Hmmm, while poloman's version may be technically correct I prefer the look of the original. It has that evening glow to it that it should have.

Here's my quick version. All i did was set the gray point off of a point on one of the players shoulder pads. Then i added an overlay layer, then used a curves layer and a little highpass sharpening. Only took a couple minutes, but i think it looks better than the original colorcast-wise. Adjusting the gray point on images seems to be a good start at correcting some color casts though. hope it helps

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looked red to me so first i added cyan, then some blue and green till they looked human again.