He's said several times he doesn't want to play in the MLS. He signed a four year contract and has been a complete professional for his entire career.
"For me, I think the MLS ship has sailed," Howard told SB Nation,
echoing comments he made back in April. "That's what it looks like anyway. I signed a new four-year contract with Everton. If you cut me open, I bleed blue and I want to finish my career there. I can't foresee myself coming back. I think there was probably a chance before I signed the contract, but not anymore."