Can I roll a SDIRA funds BACK into my 401(k) in the same year?

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Earlier this year, I setup an SDIRA and rolled a portion of my previous employer's 401(k) into it. Now, I'd like to roll a portion of that initial portion back to the 401(k). I've confirmed that I am able to do this, logistically speaking, but would like to know if there are any tax repercussions. Thanks.

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@Dmitriy Fomichenko @Mark S. I called my plan administrator today to re-confirm what I was told. I believe there was some confusion on my part initially. I've been informed that, while I am able to roll funds into the plan and take loans against the funds in the 401(k) account, I cannot make direct contributions. However, I can make contributions via a back-door rollover simply by contributing to my pre-tax IRA account and partially rolling those funds into the 401(k) account. .