It is never too late to invest in mutual funds for retirement. As such, if you plan to invest in some of the best funds, the Zacks Mutual Fund Rank can provide you with valuable guidance.

The best way to shortlist great mutual funds is to ensure solid performance, diversification, and low fees. Some are better than others, but utilizing the Zacks Mutual Fund Rank, we have identified three mutual funds that could be solid additions to one's retirement portfolio.

Let's take a look at some of our top-ranked mutual funds with the lowest fees.

If you are looking to diversify your portfolio, consider BNY Mellon Intl Eqty I (SNIEX). SNIEX is classified as an Allocation Balanced fund, which seeks to invest in a balance of asset types, like stocks, bonds, and cash, and including precious metals or commodities is not unusual. This fund is a winner, boasting an expense ratio of 0.8%, management fee of 0.75%, and a five-year annualized return track record of 10.27%.

Thrivent Small Cap Stock A (AASMX Quick QuoteAASMX - Free Report) : 1% expense ratio and 0.61% management fee. AASMX is a Small Cap Blend mutual fund, and usually targets stocks with market caps of less than $2 billion, letting investors diversify their funds among other kinds of small-cap equities. AASMX, with annual returns of 13.55% over the last five years, is a well-diversified fund with a long track record of success.

American Funds Intl Gr & Inc R2E (RIIEX). Expense ratio: 1.33%. Management fee: 0.48%. Five year annual return: 10.52%. RIIEX is a part of the Non US - Equity fund category, many of which will focus across all cap levels, and will typically allocate their investments between emerging and developed markets.

There you have it. If your financial advisor had you put your money into any of our top-ranked funds, then they've got you covered. If not, you may need to talk.